Malicious PDF — malware analysis report

Static analysis result for SHA-256 632f0c047cad8ce1…

MALICIOUS

PDF

79.8 KB Created: 2021-04-21 21:57:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11198ca78e5de973d5c0cffea8e3f745 SHA-1: d7d8806a2c8946dc5d02f64248cead50de87e290 SHA-256: 632f0c047cad8ce167f306e9b1fc8eb476bf2649239e74b33b9b8a73eb836b4e
184 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are hosted on Weebly and appear to be part of a link farm. The ML classifier and ClamAV both flagged this PDF as malicious, with ClamAV specifically identifying it as a phishing trojan. The presence of urgency and callback lures further supports a phishing or scam attempt, likely leading to a secondary download from one of the provided URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://nipisod.ru/strik?utm_term=how+do+you+reset+a+dish+wally+receiver
    • https://litepuvib.weebly.com/uploads/1/3/4/7/134741427/6321423.pdf
    • https://lodovanu.weebly.com/uploads/1/3/4/4/134403978/susojexejuz.pdf
    • https://tubemugipowiw.weebly.com/uploads/1/3/4/3/134345788/21c4187.pdf
    • https://dizorewumuzesab.weebly.com/uploads/1/3/4/0/134012942/3437679.pdf
    • https://vibejatixulaxa.weebly.com/uploads/1/3/4/1/134131444/372735.pdf
    • https://zakewurez.weebly.com/uploads/1/3/4/4/134471700/vepas.pdf
    • https://kevonixoxudunu.weebly.com/uploads/1/3/0/7/130775897/7811904.pdf
    • https://diwowure.weebly.com/uploads/1/3/4/5/134592565/33616.pdf
    • https://tidevaxapoled.weebly.com/uploads/1/3/5/9/135971763/roduxoki.pdf
    • https://fegodapu.weebly.com/uploads/1/3/0/7/130775911/6382e.pdf
    • https://mazekijaxok.weebly.com/uploads/1/3/1/4/131453602/zuvotemipiz-tanuvoxisi.pdf
    • https://tofabefanij.weebly.com/uploads/1/3/4/7/134726630/9c7d783c789.pdf
    • https://toruganaduloxo.weebly.com/uploads/1/3/5/3/135347606/ruvub-nefevalokumoke.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/43583ca2-8ff9-498e-9e11-95221e229274/maze_runner_thomas_character_traits.pdf
    • https://78151a86-a557-4e49-81aa-a2539eea45c7.filesusr.com/ugd/204f4f_90eb9a1070db4087b9f081ad5a3b469f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a2448a46-2440-4a02-a2ae-ff1280c4bb24/viking_range_repair_calgary.pdf
    • https://uploads.strikinglycdn.com/files/073bfd65-56fd-4433-8b3d-18ea83263b3b/bogolalojawa.pdf
    • https://uploads.strikinglycdn.com/files/c55c641b-6588-4496-bb91-b6e5372d1b56/mackie_802-vlz3_review.pdf
    • https://uploads.strikinglycdn.com/files/91640842-7933-4a5a-a34f-65d6b607c284/80635169122.pdf
    • https://uploads.strikinglycdn.com/files/ef2cb399-b635-4085-9349-bf268507ad48/free_storyboard_tool_online.pdf
    • https://uploads.strikinglycdn.com/files/def9a845-7c38-463f-8118-18675f163d2e/emotional_labor_definition.pdf
    • https://uploads.strikinglycdn.com/files/e23b97bd-e118-461b-a5a9-e0f6d8ba7ad6/how_to_turn_on_a_eureka_airspeed_vacuum.pdf
    • https://uploads.strikinglycdn.com/files/ba6fddeb-0a72-4254-9f66-34157547ab30/why_are_my_beats_solo_not_turning_on.pdf
    • https://bdc3fad0-85dd-4e34-85f7-620d54d4ff6f.filesusr.com/ugd/10cedf_57404119e8c44a19abb5b65db28850d4.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f901.bin
1e0f844175feae9a25abd8188dc0b82b14c6973fc79164290e637a5de039cfc2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF901 5244 bytes
font_01_sfnt_off00010ae7.bin
012d3005d29f7f60f595a99ada02071c2d2f5f8e9ca2d1fdcb164a29e204a1c1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE7 11448 bytes