Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa7fe5b6d3772836…

MALICIOUS

PDF

78.5 KB Created: 2021-05-24 23:57:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8ceb73bece51a1ec75299c45631340b0 SHA-1: 94214d69e09749c47493d1bce7eb22b12084c528 SHA-256: fa7fe5b6d37728361c082dba611aafc95b20316480b05e8769be97b2b8a9845c
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 0.9967

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://druttle.ru/strik?utm_term=how+to+reset+expert+grill+thermometer PDF link annotation
    • https://bexusisase.weebly.com/uploads/1/3/4/5/134596812/7648914.pdfIn PDF document text
    • https://wufewevaso.weebly.com/uploads/1/3/1/4/131453291/tibomubokukuged-revufu-fonodego-vewefavosapiru.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456378/normal_6043fa37d6462.pdfIn PDF document text
    • https://gugozakeku.weebly.com/uploads/1/3/4/5/134588211/f5abf5bd215e57a.pdfIn PDF document text
    • https://jadegivi.weebly.com/uploads/1/3/4/8/134851053/3f235fdbf2fdfb.pdfIn PDF document text
    • https://sobexezawatu.weebly.com/uploads/1/3/4/9/134903145/loxibodawujawi_fufemivi_dilafigaxone_bijunodamepax.pdfIn PDF document text
    • https://xibigulekin.weebly.com/uploads/1/3/0/9/130968960/varifepobu_zidun.pdfIn PDF document text
    • https://tuverasoxodos.weebly.com/uploads/1/3/4/7/134745130/32fc6.pdfIn PDF document text
    • https://rinapaluvubozi.weebly.com/uploads/1/3/4/6/134669605/1362946.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375708/normal_5fdcb205716d9.pdfIn PDF document text
    • https://fejenugid.weebly.com/uploads/1/3/4/0/134016750/7821505.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426832/normal_604b7e5b11de9.pdfIn PDF document text
    • https://parafobosa.weebly.com/uploads/1/3/1/8/131857791/a15f6523.pdfIn PDF document text
    • https://bopugokux.weebly.com/uploads/1/3/4/9/134901566/8b1e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392462/normal_5fd78ae29aa44.pdfIn PDF document text
    • https://gemiletux.weebly.com/uploads/1/3/2/6/132681217/worerebaroju-megesege-nasalojori-javigor.pdfIn PDF document text
    • https://tazapupexon.weebly.com/uploads/1/3/4/6/134634001/fa649874680c.pdfIn PDF document text
    • https://talotemeve.weebly.com/uploads/1/3/1/6/131606578/3bf90fd3b.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/guxosa/messenger_android_free.pdfIn PDF document text
    • https://s3.amazonaws.com/gavapozalilup/bollywood_movies_online_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a154c2b-8775-47cb-a08f-0bfa63cf1356/what_are_the_best_careers_for_infj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44fd20a6-fdeb-4b46-b30e-190a379dfcad/19350197529.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ebf31bb-9daa-4207-8ee5-0b6c3fbd840f/24760048414.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05992f68-7659-4f99-bc24-83c565be0af9/43916209965.pdfIn PDF document text
    • https://s3.amazonaws.com/zagapaxa/graco_pack_n_play_bassinet_recall.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/attack_on_titan_season_4_episode_guide.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_off0000f3c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C1 5144 bytes
SHA-256: 0e766a5efc24252acdc8379c6a41e19ba766aed80e26ac80f3746f8e3b6cc5cf
font_01_sfnt_off0001052c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052C 11588 bytes
SHA-256: ed63793e4c7fe0fb24d2b8ddd7c3c9a6d07b4362b9f5b4b77100b241e984d60f