Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1e855bde0028dfa…

MALICIOUS

PDF

83.7 KB Created: 2021-04-03 21:55:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 7c008dc6404aabfea4b2e257ba70faa6 SHA-1: 2b11436e117593dec49c3d1c9d80dec236c6fa6c SHA-256: d1e855bde0028dfa19f510cbea165895004efac01f303cd5ec8294624296f0e0
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO poisoning tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The document body, though truncated and obfuscated, contains keywords related to electrical wiring, suggesting a lure to attract victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://nipisod.ru/strik?utm_term=how+to+install+residential+electrical+wiring PDF link annotation
    • http://fitokapss.xyz/977873316215qgy2.pdfIn PDF document text
    • http://gazariruv.iblogger.org/28557328261.pdfIn PDF document text
    • http://ridunculus.com/tin_tin_dog_in_french2bd1z.pdfIn PDF document text
    • http://caterm.ru/kiwijatikny9kw.pdfIn PDF document text
    • http://blognews.top/husqvarna_viking_sewing_machine_price_listm633k.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nigixifeza.rf.gd/a_dolls_house_essays_download.pdfIn PDF document text
    • http://xikapewegoruzom.epizy.com/50704531367.pdfIn PDF document text
    • https://6323cc82-cf72-43ae-bc7a-f8d691a1d37e.filesusr.com/ugd/4f3578_81a288b35c81429ba68d0be152d6fb0d.pdf?index=trueIn PDF document text
    • http://mekokenidu.rf.gd/wobotozopotufaguwobafepef.pdfIn PDF document text
    • https://30383b9b-b26a-44f4-9a26-03873af8f03c.filesusr.com/ugd/fdee49_d799d72eb92f4b0f85b2048bd8a3ef94.pdf?index=trueIn PDF document text
    • https://a72b158e-cead-41d6-a0b3-8518216316a4.filesusr.com/ugd/35c6e2_874a9be39556457584e57aca0307f870.pdf?index=trueIn PDF document text
    • https://68fdcf0a-b1f0-4758-9edf-48d2be6d990b.filesusr.com/ugd/ac51ce_8f30c6dd6a3b417db901b07683fe452c.pdf?index=trueIn PDF document text
    • https://a1f0096d-76f5-425c-b826-5ccbd312c1bc.filesusr.com/ugd/8f8c07_3d402707cda64bdd84d6e311ef0fcc4f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/757de3b2-4382-44d7-a22f-6b317de9a27a/71576631010.pdfIn PDF document text
    • https://73af689e-4c80-4f62-99d3-7a886641ad81.filesusr.com/ugd/3b5dd9_ae567209f8ac440ba07e3a6784ad747f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ebc793a-ba7c-435b-9570-b1ed4344f248/metaphor_used_in_romeo_and_juliet_act_1.pdfIn PDF document text
    • https://e0d0d77b-4c00-4265-bc22-f0cc5cf11ada.filesusr.com/ugd/957eb4_0901c57e7ca6499fa25ceb66aa1f0a7f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f35d26b7-f36d-4773-82c0-473da8c5a3d3/art_of_game_design_lenses.pdfIn PDF document text
    • https://694dae7a-2033-4a59-8b06-91ff4eec0774.filesusr.com/ugd/e1d58f_8671c684a97f42cdb91050d2af321f33.pdf?index=trueIn PDF document text
    • https://4eb83289-b313-4542-b68c-79a1d4783db4.filesusr.com/ugd/f6336d_27a6dce782f84616a34ad4d2c0e0e86d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/499e407a-f3aa-40fc-a9f3-e53cf8a3a357/book_summary_48_days_to_the_work_you_love.pdfIn PDF document text
    • https://a1d3e036-d9a1-4be1-9d2f-eedbb581cb22.filesusr.com/ugd/3ce946_14caf6a0a9da412b989d5f8f7e4d9320.pdf?index=trueIn PDF document text
    • http://nilubipaviwi.rf.gd/popejelesuneboratijewowe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3e3f19a-7295-4cd4-a23b-f5dc9628cf30/xukefamisas.pdfIn PDF document text
    • https://76df98a8-3e94-4eee-a6f5-23e1de06049b.filesusr.com/ugd/54c74c_d87c78575a8c40c8a16d13afd929d065.pdf?index=trueIn PDF document text
    • https://972af30b-04c2-4618-b911-83ba0b7fef9e.filesusr.com/ugd/84a5c6_ea4a88b61b0a40dd80471a7b2c25e06c.pdf?index=trueIn PDF document text
    • https://780c8f77-0f51-49ab-8dd1-60a90eb210a4.filesusr.com/ugd/1b8612_8a705e78c6474e1093ee941ea318e694.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000109c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C4 5160 bytes
SHA-256: e0f986097a25ddf75deb2174a62775766fac81db6e8d3ed3cabd6d70b93f4a2b
font_01_sfnt_off00011b6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B6F 10964 bytes
SHA-256: efe9b9572e48a79a5e2ce3cec27ae8856d99e832fe573255e0a5109d65d00b40

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