Malicious PDF — malware analysis report

Static analysis result for SHA-256 83fa6b1a1f4f1ea6…

MALICIOUS

PDF

72.5 KB Created: 2021-05-16 04:20:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 79be8d124a915b9388572fed0c3ba530 SHA-1: b58dd8ac4655be7148d8ed277f55f5845bf5601a SHA-256: 83fa6b1a1f4f1ea6e4971920ee8616c4226d24e75683a507226f734c155b987a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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 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://crophysi.ru/strik?utm_term=the+last+song+full+movie+free+no+sign+up PDF link annotation
    • https://cdn.sqhk.co/fobonelaga/bijjedI/41819515186.pdfIn PDF document text
    • https://cdn.sqhk.co/birofinud/gbghjdd/memuzuniru.pdfIn PDF document text
    • http://my-favshop.online/nozoforaluduxemeloq7dwr.pdfIn PDF document text
    • http://reduslim-italia.website/nezupikodatodebotogd97b.pdfIn PDF document text
    • https://cdn.sqhk.co/xiladuxe/ZjcKUjj/13418374741.pdfIn PDF document text
    • http://joy-todays.online/english_dictionary_full_words_2020fpv7b.pdfIn PDF document text
    • https://cdn.sqhk.co/xivomojuf/fIIcXih/zero_vector_space_contains_subspace.pdfIn PDF document text
    • http://particulier-societegenerale.xyz/what_does_it_mean_to_be_written_in_the_book_of_lifeda2n0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2daccc73-8708-4113-a26a-4f38906335d9.filesusr.com/ugd/f65175_ea056c958f174aa8a7935331e88452eb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zibenoroduzuw/nanuta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c32cb6cf-212b-419c-bea1-81d7ab3c8e62/19336330684.pdfIn PDF document text
    • https://b81e1767-bb0d-4562-9f98-cfef66859bb1.filesusr.com/ugd/b48b60_a941dcc67c834786a5d0d4eda4c8e6b7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c056cba1-b409-46e5-85b3-52a8566ca92b/is_it_better_to_boil_ribs_before_grilling.pdfIn PDF document text
    • https://238a82c5-85a8-4641-a991-2f0f5270ddc4.filesusr.com/ugd/63f22d_f31ff11848fd4111a6b7b949a9c89880.pdf?index=trueIn PDF document text
    • https://6afed14e-2b01-442b-8c2e-11a8a6f39965.filesusr.com/ugd/46a5ae_2bf3d9c0ce2a451790830f0abd640536.pdf?index=trueIn PDF document text
    • https://62bfe9e3-d01a-456c-9d14-3ac71290fd99.filesusr.com/ugd/cfe640_f663fbc90c1a408eb40a5ee9b0911979.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gekojulog/14563153293.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6e4c93d-3833-41c8-8fa5-6822eec67e08/jocko_willink_favorite_movies.pdfIn PDF document text
    • https://s3.amazonaws.com/wetevali/samsung_dw80j3020us_instruction_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/widiku/61231595258.pdfIn PDF document text
    • https://s3.amazonaws.com/jijumupade/idabel_ok_police_reports.pdfIn PDF document text
    • https://c3438639-6a75-4920-aa4f-d1e0b619354f.filesusr.com/ugd/3be3a7_a2017e5a887c4dceac73a37f2f809222.pdf?index=trueIn PDF document text
    • https://d4cba69e-f3c5-4a64-9e40-69ba24924691.filesusr.com/ugd/b73feb_945cb735ed974fd8820971cb85fdd127.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_off0000dd04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD04 5324 bytes
SHA-256: c6d1edbf2d897571a1864960937fadd3f6183f6d30cebc0d7ea498ac8d21ee92
font_01_sfnt_off0000ef01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF01 10940 bytes
SHA-256: 546cee58b2161467519372ed9069c92f50234c12d2321ecca00ed32c9ab6d3fb

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