Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f04ca6d26e306a6…

MALICIOUS

PDF

69.4 KB Created: 2021-05-02 15:47:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: f3604131390545697d77db043275cc39 SHA-1: ebca30588a4ac86a4693b8c820c0891c24f27ca0 SHA-256: 3f04ca6d26e306a63f6a610745c47221b31b8214c9c0fbf0c20f2c13244a6143
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jottigo.ru/strik?utm_term=tokyo+ghoul+anime+review+reddit PDF link annotation
    • https://sozatoma.weebly.com/uploads/1/3/4/4/134484551/daxekikizoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367302/normal_6050406f498e8.pdfIn PDF document text
    • https://pofunowiri.weebly.com/uploads/1/3/3/9/133997400/9414352.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393346/normal_5feeb63dcabe9.pdfIn PDF document text
    • http://mexicotop.xyz/11829654352kjgh3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488604/normal_6056f52d6295d.pdfIn PDF document text
    • http://899themes-demo.ru/vewaledunuvapugaxagatufhk7b.pdfIn PDF document text
    • http://yandex-dostav.ru/uniden_800_mhz_300-channel_base_mobile_scanner_bc355n_manual9ss5o.pdfIn PDF document text
    • https://rofofomigedug.weebly.com/uploads/1/3/4/4/134486696/5478880.pdfIn PDF document text
    • http://autoport76.online/3rd_grade_math_review_worksheetsnnev5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445739/normal_6012414a57dcb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393752/normal_60228425af615.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c8a6556-d8cf-4844-871a-c8739d8e9a44/bissell_powerforce_helix_2191_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3cdeb03-f658-41b6-997d-1c433d10f282/kygo_-_carry_on_lyrics_ft._rita_ora_tekst.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c524075-8e5b-4a7e-835e-ecff54495a57/daxoxapebipedineburokolu.pdfIn PDF document text
    • https://8ab1a2d5-e5b1-44c5-a28c-e09959565f0d.filesusr.com/ugd/eb712c_e912dae7496c4187a7980ab11d6e0f48.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a407d907-90fe-45ff-ae83-b18250147b49/descriptive_words_that_appeal_to_the_senses.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af7730d5-1a47-4d36-a52b-037eb8db438e/zoluzirasulofum.pdfIn PDF document text
    • https://5e446c31-fcb6-4427-a178-91ee45bbff8b.filesusr.com/ugd/4e76b8_69830e6f87374c6c882a659be6fb8814.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f815131-186d-4016-b198-2bf71f6dbf68/61138229837.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66fb43a7-d95c-4454-b22c-8997d58f257f/why_does_my_fitbit_keep_turning_itself_off.pdfIn 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_off0000d297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD297 5328 bytes
SHA-256: 48d7dcf131f9cdc9e74a6767745800683862fa0a4a46e54793d95f7efca714de
font_01_sfnt_off0000e4a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A9 10336 bytes
SHA-256: 79b9e4b90bd2bc49f858bd5df6b429bcb9c515954297a47d9a45f45b1a5dc83e