Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3529b779178ee52…

MALICIOUS

PDF

75.5 KB Created: 2021-03-09 06:02:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 835bd27c5b8824a191d019bac6714f2b SHA-1: 99bdf9487912661fee3edec2f747631891d7e909 SHA-256: c3529b779178ee5206fa9324be9ccef5e2f29bc34f73524762c47a9abc69563a
146 Risk Score

Malware Insights

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

The file is a PDF document that contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm. The heuristic 'SE_CALLBACK_LURE' strongly suggests a callback phishing or tech-support scam, where the user is prompted to call a phone number. While no scripts were explicitly extracted, the presence of external URIs and the nature of the heuristics indicate a malicious intent to deceive the user, likely leading to further compromise or financial fraud.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://golowaki.ru/wix?keyword=qc+certification+corp+of+engineers PDF link annotation
    • https://tosoremekik.weebly.com/uploads/1/3/4/7/134771766/jamafalavalener_zuvijup_lugijova_feribekabudu.pdfIn PDF document text
    • http://trokot-shopnew.online/android_tv_oreo_x86_iso_downloadiwp4x.pdfIn PDF document text
    • http://hushseo.online/thomas_merton_the_seven_storey_mountaingoade.pdfIn PDF document text
    • http://prodson.space/worksheet_review_trig._identities_basicpvg0k.pdfIn PDF document text
    • http://frukt.fun/rolapejerwwabs.pdfIn PDF document text
    • http://hangookoil.ru/freshii_catering_menu9ixf0.pdfIn PDF document text
    • https://sererepe.weebly.com/uploads/1/3/3/9/133999843/7620167.pdfIn PDF document text
    • http://jusojixanona.getenjoyment.net/55208427318.pdfIn PDF document text
    • https://juxibawazorar.weebly.com/uploads/1/3/3/9/133997202/guvodezela.pdfIn PDF document text
    • http://winoraama.website/depobufazijeganoczys.pdfIn PDF document text
    • http://kemamibuke.mygamesonline.org/what_is_the_difference_between_dog_and_cat_frontline.pdfIn PDF document text
    • http://sodalabs.pro/the_giver_chapter_14-15_summaryot69o.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7a9095e9-4ba3-4ff7-9406-a75d0382ce8a.filesusr.com/ugd/db93e9_79fbcb68722846469defa6c755a7ee27.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wovisak/truck_air_brake_sound_effect_free.pdfIn PDF document text
    • http://gevejonitu.onlinewebshop.net/did_charlie_from_flowers_for_algernon_die.pdfIn PDF document text
    • https://973697ad-ffa4-4f9d-85cd-0c9d1ea039ee.filesusr.com/ugd/5f5755_010174c4086149e98dfac867dae1591e.pdf?index=trueIn PDF document text
    • http://bifovigavij.myartsonline.com/monster_island_2004.pdfIn PDF document text
    • https://2acf176d-1645-44e4-83be-c67f7ac9af6b.filesusr.com/ugd/e72dd6_b5f6ba4cb7724d7eba04cfd222df6d61.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zubata/5387061980.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_off0000e8f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F7 5212 bytes
SHA-256: 70fa5fb0d47dd6a40e618f9391dabdac3c1d79c95abcb69ea1d76831086ea48b
font_01_sfnt_off0000fac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC7 11244 bytes
SHA-256: eaaa69116cb46367ef36bcf6a050d0e3f14a78fd647915625e8379e26eeecce8

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