Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b99a611b5420c06…

MALICIOUS

PDF

83.2 KB Created: 2021-03-23 03:19:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 86a0bd723a339006975ac5fa5e767eef SHA-1: dda7d03642711add8ecbb19102c08faae107419d SHA-256: 7b99a611b5420c06f0a8258f21c4a3a2193c2331d5143d610645f29369fad565
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 0.9994

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://jumiwimov.ru/123?utm_term=clep+exam+online+study+guide PDF link annotation
    • http://paxosij.mygamesonline.org/noxiva.pdfIn PDF document text
    • https://cdn.sqhk.co/sesakiwewe/hcibiiM/download_game_blood_arena_mod_apk_offline.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481285/normal_5fcd882b28274.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389353/normal_5ffd4aba74448.pdfIn PDF document text
    • http://jadogaxarabu.mygamesonline.org/86701433711.pdfIn PDF document text
    • https://cdn.sqhk.co/xosaletozobi/pf7x3wU/factors_affecting_test_validity.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425929/normal_604680501ad36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417321/normal_603bf9425ca43.pdfIn PDF document text
    • https://cdn.sqhk.co/pelopuxi/1Chbiet/15903564253.pdfIn PDF document text
    • https://cdn.sqhk.co/dimowitop/ifGHcsj/marble_2020_mod_apk_offline.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/veladinunojidilomole.pdfIn PDF document text
    • https://4123e755-5e7e-4fb8-b167-49ba90d37259.filesusr.com/ugd/fd3290_73fd6a3ab1534f04ad58aa243e9b2590.pdf?index=trueIn PDF document text
    • https://712e085e-8422-4094-ae2e-709d430f1fc9.filesusr.com/ugd/bf8edb_f90821d4f3b8459b845e4f275915345f.pdf?index=trueIn PDF document text
    • https://98be45bc-63b9-4117-aff7-84a3d4f2c4a0.filesusr.com/ugd/90c678_c5a0c7fd8ac9475597142cf8490f4eb6.pdf?index=trueIn PDF document text
    • http://vidugozu.atwebpages.com/craftsman_electric_start_snowblower_manual.pdfIn PDF document text
    • https://9e1b5e4e-b4ab-405b-8fdf-b3b6d7b19c28.filesusr.com/ugd/94ea38_eb3a21b4dedd466f828a1cc40558fbd3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tawovojo/ipcc_2018_report_summary_for_policymakers.pdfIn PDF document text
    • https://s3.amazonaws.com/votubukaxogilix/nevux.pdfIn PDF document text
    • https://a21f0d7d-5fe0-4a99-a381-3b18266e0880.filesusr.com/ugd/6c313a_edb68293c97d43068532d3463edfe760.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rurosaveruk/62917572579.pdfIn PDF document text
    • https://s3.amazonaws.com/semuxemakaw/26924354227.pdfIn PDF document text
    • https://1f49b3f1-4b09-4f89-88df-03804352fc9a.filesusr.com/ugd/a51aec_c0b84f0d61bb40498bacfdfc0c20a590.pdf?index=trueIn PDF document text
    • http://lobopekogolo.onlinewebshop.net/best_cigarette_rolling_machine_australia.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

Related samples 7

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10801 5260 bytes
SHA-256: a00397e5c8cfb06f26b1fa96b21a3b63863d5ec7a30b226557c5cfb09cf13b22
font_01_sfnt_off000119dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119DC 11172 bytes
SHA-256: 4554b4dc2d2db54789fa7c208199d7408daefe5a24f4f4dea47c7219b9fb0a59

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