Malicious PDF — malware analysis report

Static analysis result for SHA-256 988a3f74d0197363…

MALICIOUS

PDF

94.8 KB Created: 2021-03-30 02:40:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 5c18c101125337d17fe66370d1d6ec9e SHA-1: 5a9e43c1b5d267a79e65de899b634f69f2f7f0e8 SHA-256: 988a3f74d0197363f9e7be925055e619f43f3f0c75e735cf2bf4e4ce909f1cb7
206 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. It uses a callback-phone (TOAD) lure. 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 0.9993

Heuristics 7

  • 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 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.
  • 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://bologen.ru/strik?utm_term=7mm+rem+mag+reloading+data+hornady PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4467286/normal_60470bd1329b8.pdfIn PDF document text
    • https://gozerivolese.weebly.com/uploads/1/3/4/2/134265833/vuxubevip-vufedolazi-zaxizexugakasaz-tanotozuxera.pdfIn PDF document text
    • http://fuwiduwoxobol.mygamesonline.org/fudixunesijenavepaboput.pdfIn PDF document text
    • http://sesesuruko.mypressonline.com/angelus_silesius.pdfIn PDF document text
    • http://xibawolafubiz.getenjoyment.net/authoritative_leadership.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427094/normal_6031464e73287.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379603/normal_5fe83ad9d6840.pdfIn PDF document text
    • https://cdn.sqhk.co/fazologim/gcg0hae/nesolepuxitaretuxi.pdfIn PDF document text
    • https://cdn.sqhk.co/zitedefew/nMGggia/kujabisovused.pdfIn PDF document text
    • https://cdn.sqhk.co/rogenujudita/jikXSge/electronics_supply_store_near_me_now.pdfIn PDF document text
    • https://cdn.sqhk.co/xuvisisitinu/hieibgc/does_frndly_tv_work_on_apple_tv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425209/normal_602d374a82ecc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4531626/normal_601584107e77e.pdfIn PDF document text
    • https://ruritavi.weebly.com/uploads/1/3/3/9/133988031/f8ddcf0.pdfIn PDF document text
    • https://xabanovodo.weebly.com/uploads/1/3/0/7/130739860/gevipobabikid.pdfIn PDF document text
    • https://cdn.sqhk.co/tawibonikigo/zih6f4V/28760293165.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/687e7024-1e03-4a9d-971e-04201909ab34/52154935131.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5825ebd6-c68f-45c6-9634-0f387660840a/call_me_by_your_name_watch_free_online_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcd78471-b455-4653-81ad-a63c3f3b36e4/28918293633.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d801c053-3fe4-4648-9ea6-25674b7eb961/meanwhile_back_at_the_cross_lyrics_and_chords.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05ea9259-2a08-4548-aa32-58f6fddefae8/does_dish_network_have_4k.pdfIn PDF document text
    • http://pogetowem.onlinewebshop.net/54804836278.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6192ce5-44f9-4777-bfa0-59e5e842dd96/69657394869.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_off000137d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137D9 5148 bytes
SHA-256: 2c1fff01e83248e4e5939b1db28db8bea5cba4eae054c01e489abc1e839fe8e3
font_01_sfnt_off00014936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14936 10784 bytes
SHA-256: f82eac392cb10b49abff405132ec6b6a28d4fba9417548e6f8c861608f24b9cf