Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c20fee886d91682…

MALICIOUS

PDF

71.4 KB Created: 2021-04-01 13:49:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 3fc4a09a63f0dae353f929474c101871 SHA-1: 70f15781f30b059e8ba08df5a4ce0e3cfea46239 SHA-256: 3c20fee886d916821779f1cb46a2a29eb2c96f76125da65ab40af3b12d72faeb
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or SEO spam. While no scripts were directly extracted, the nature of the link farm suggests it could be used to distribute further malicious content or lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://seumenha.ru/strik?utm_term=kayla+workout+youtube PDF link annotation
    • https://cdn.sqhk.co/rekutadis/je6gda0/granny_smith_apple_calories_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/puvubuzu/hHhcgfN/37708506697.pdfIn PDF document text
    • https://cdn.sqhk.co/wutijiwatar/nbF60nx/masusabe.pdfIn PDF document text
    • https://cdn.sqhk.co/jobezivozuf/ax9jjif/jutog.pdfIn PDF document text
    • https://cdn.sqhk.co/sotatixorawi/cuiaSAV/cricket_wireless_reviews_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/nozesinipi/xZgifJr/31182323564.pdfIn PDF document text
    • http://xupenirulavep.iblogger.org/tum_kab_jaoge_atithi_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/mopewedote/fbXhdlv/pocket_save_read_grow_apk.pdfIn PDF document text
    • http://dovogonusiru.iblogger.org/25349252307.pdfIn PDF document text
    • https://cdn.sqhk.co/giwumazusew/j7xgxhe/china_kung_fu_master_full_movie.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/vavapekadoliti/commodore_64_emulator_para_pc.pdfIn PDF document text
    • https://4bd9ed84-c80b-4837-bb2f-b1353ebfd8aa.filesusr.com/ugd/5a1791_ed10b11c65674533972f726e0e16adcb.pdf?index=trueIn PDF document text
    • https://1fc3e790-19e1-43b7-bae7-d09a953f51fe.filesusr.com/ugd/2c608b_f10e723a299d49ca8e5c1734589d9036.pdf?index=trueIn PDF document text
    • https://3bcdeb60-9876-4d14-bc0a-1dd1632c647c.filesusr.com/ugd/16a96a_edba28d31a9d4626a811043d8dbd1448.pdf?index=trueIn PDF document text
    • https://562c2315-396f-49d1-9e45-1236e049cb13.filesusr.com/ugd/ec0012_a5b7e58f8ebc4310bdce445123dcf3dd.pdf?index=trueIn PDF document text
    • http://jinuritubamo.rf.gd/ragnarok_mobile_blacksmith_build_guide.pdfIn PDF document text
    • https://201a0bc5-0eb3-4135-8969-828875a6b07d.filesusr.com/ugd/607883_8e4aeb05870a4e5ea6d73e2a407419f2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zetubakuz/decompensated_heart_failure_guideline.pdfIn PDF document text
    • https://e61e9f85-32c5-4861-9fd4-b89109084c35.filesusr.com/ugd/2e4eb4_690247bcb3354501b9d75ca06cdbb69d.pdf?index=trueIn PDF document text
    • https://5e54824a-8208-41b0-8aeb-7c017e8cfb46.filesusr.com/ugd/f64db8_222e91ea6ec7406b97c3af09f8a05688.pdf?index=trueIn PDF document text
    • http://papasebaxot.rf.gd/zolezoweduvubexagami.pdfIn PDF document text
    • https://s3.amazonaws.com/sikuva/comic_strip_template_printable.pdfIn PDF document text
    • http://putotapuzavip.rf.gd/best_tv_show_tracker_app_android.pdfIn PDF document text
    • https://e148473a-3d1a-46f8-b788-fbc1f5af68d4.filesusr.com/ugd/e1e70b_509818fc544b434189decc4e6fb76f3f.pdf?index=trueIn PDF document text
    • https://19aaccd0-9772-41b6-85c4-be118606641a.filesusr.com/ugd/a12125_187c07b8f89842988f46bf4dd1e14e8e.pdf?index=trueIn PDF document text
    • https://f0ef5849-56f4-4665-9409-a4e47f47d862.filesusr.com/ugd/205ae4_99e526d875f84544a45893560931ff34.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_off0000da4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4A 4868 bytes
SHA-256: dc9bdb378ac147d9c6276ded958cb7d87a41c85020ed0694b6218ad1bc2e3455
font_01_sfnt_off0000eb01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB01 10860 bytes
SHA-256: 9b3e23e4c9467808d4463ebb443a02c0549d534966a14673f261fc4a697a26a0