Malicious PDF — malware analysis report

Static analysis result for SHA-256 d43d2737ceb12743…

MALICIOUS

PDF

77.5 KB Created: 2021-03-08 07:53:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 8c85f1e65f1ffd7294befa8c1a24a509 SHA-1: b5006ebcb70288598da1215bac9deb66bf852b2f SHA-256: d43d2737ceb12743a81ea3cf33b15397b646e3e5d4b86c1998e468627b5d71ce
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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, suggesting a link farm or SEO poisoning tactic. The document body, though heavily obfuscated, contains keywords related to drivers and operating systems, aligning with the heuristic findings of a link farm and external URI usage. The ML classifier strongly indicates maliciousness, and the overall structure points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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://ponafet.ru/strik?utm_term=dell+xps+8300+drivers+windows+7+64 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4419847/normal_601f1fafc6f8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383797/normal_60234c4733e25.pdfIn PDF document text
    • http://lutafem.getenjoyment.net/hornady_reloading_manual_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457868/normal_5fdfd8934830a.pdfIn PDF document text
    • https://cdn.sqhk.co/gevajoke/O9heiaO/fun_icebreaker_questions_for_small_groups.pdfIn PDF document text
    • http://gixelube.iblogger.org/kekusuvezevexesinagope.pdfIn PDF document text
    • http://kirakexig.mypressonline.com/diary_of_a_wimpy_kid_rodrick_rules_book_summary.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386073/normal_602394b33853a.pdfIn PDF document text
    • https://cdn.sqhk.co/zejizoguzut/gfxjeid/jewel_hunt_match_3_classics.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vubulebutaxa.epizy.com/acsm_cpt_practice_test_2019.pdfIn PDF document text
    • https://ec679cc6-872a-45a8-b2fd-b1bc8f6ddb77.filesusr.com/ugd/d1d005_8470c503602441abb860c01806840702.pdf?index=trueIn PDF document text
    • https://9df6e0af-a028-4e88-91ba-61a1b37318d5.filesusr.com/ugd/7c1f05_dd3af0d9e04e479eaae7ca7a125fc51d.pdf?index=trueIn PDF document text
    • http://setuvufijub.epizy.com/bhakti_songs_video.pdfIn PDF document text
    • https://9db8f275-5044-409a-aa1b-3306d9dda9bd.filesusr.com/ugd/361f4b_888937fab7444473bf5caddfc0fb584e.pdf?index=trueIn PDF document text
    • https://5d3a3edc-1384-4eb0-a354-174dd54c13aa.filesusr.com/ugd/7f5dc5_a4d99fe2c67a4fb397fef0ad70c2b847.pdf?index=trueIn PDF document text
    • https://a540aa65-2eb1-4ac3-86d0-bf6a54daac96.filesusr.com/ugd/2d797c_13f9b9b23c744da3a1fe65d845aca3c6.pdf?index=trueIn PDF document text
    • https://6f8cb219-4830-455d-9ced-b55e65700e85.filesusr.com/ugd/fd30ac_9135f316b43840828f77448a8aa60075.pdf?index=trueIn PDF document text
    • https://ef4b221f-cfb4-47e8-bf1d-3b5092770df7.filesusr.com/ugd/4948da_c93d2147825942a9a8899181cb9db8fe.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_off0000eb91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB91 5784 bytes
SHA-256: 630d62fc7b246b9bfe8d3331cf8c0ea96ab97ca09f4f9f5b1ec9bbb22d7546b5
font_01_sfnt_off0000ff78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF78 12196 bytes
SHA-256: 9ba4ced80ee6decee0ff9307d167ff32249f0b86ca1a678aaa6ee5ca6be2ae90

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