Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc881d925f17bb68…

MALICIOUS

PDF

77.1 KB Created: 2021-04-02 09:14:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3e76817944b766b3b94149506cd3ff38 SHA-1: 72fb6b7d98e4d3a1b9ca069657b0eef2ce01b94c SHA-256: cc881d925f17bb687be542f662c0a53f115e4d6eeefa8422bd80190944f8b80c
186 Risk Score

Malware Insights

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

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 0.9997

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://lozipotod.ru/wix?keyword=pitch+perfect+streaming+online+free PDF link annotation
    • https://cdn.sqhk.co/malevevipali/gjfeji6/ivory_color_paint.pdfIn PDF document text
    • https://cdn.sqhk.co/kimefutif/qhdjdjf/lock_screen_naruto_live_wallpaper_iphone.pdfIn PDF document text
    • http://revershjtb.site/77713724937vgus2.pdfIn PDF document text
    • https://cdn.sqhk.co/nolagutotato/1hd6hj9/86288942823.pdfIn PDF document text
    • http://myluckybet.xyz/51626320002l4ak.pdfIn PDF document text
    • https://mabajiluvepe.weebly.com/uploads/1/3/1/4/131409333/pafizukopogo-febiramipagusa-kefudowif-getigamodo.pdfIn PDF document text
    • https://cdn.sqhk.co/ramazunor/vhCAiiG/modern_warrior_martial_arts_modesto_ca.pdfIn PDF document text
    • https://cdn.sqhk.co/lorotukogof/fhdjcje/fumulusevojapubijibebof.pdfIn PDF document text
    • https://cdn.sqhk.co/fovipobex/c2jh9hh/tumblr_wallpaper_for_phone.pdfIn PDF document text
    • https://jawenovexexadu.weebly.com/uploads/1/3/4/0/134012785/lovenivogakowoxed.pdfIn PDF document text
    • http://grantmedica.ru/96568808195x0div.pdfIn PDF document text
    • http://promoocaoameericanas.com/new_york_times_spelling_bee_game_answersi05lv.pdfIn PDF document text
    • http://jadebey-x.com/98523321146r7ft9.pdfIn PDF document text
    • https://lezevonunibo.weebly.com/uploads/1/3/4/5/134577944/pufor-jesujasutuwota-pagizufaxixaga.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://667abc8f-92ca-45d9-bc9d-789c80a68858.filesusr.com/ugd/dcd78f_a1eb091fe5f44867a4f4bc63269902a6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/divelatoxa/envisioning_information_by_edward_r._tufte.pdfIn PDF document text
    • https://ce83042b-5faf-46b5-bcbb-9b4d05ec7d33.filesusr.com/ugd/a31856_ea861ab7dc914e6dada7bdbfd2d7349f.pdf?index=trueIn PDF document text
    • https://d25e5d79-f3dc-43ab-8538-58f2f4730235.filesusr.com/ugd/898300_7da61f15c8ba4903b783d4533b7a8b24.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fazujo/what_is_physical_and_human_geography_ks2.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxime/czardas_piano_sheet_music.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_off0000f15a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15A 5432 bytes
SHA-256: 844c679c9613a91a58e50be045aad804922c6595704fae765919f9422c8db2f5
font_01_sfnt_off000103ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AD 10384 bytes
SHA-256: d2b8e3391d8a6aeb4b8e20b41d9802e7ad6ccbc7d63c058cd3ae2dc6a828c952

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