Malicious PDF — malware analysis report

Static analysis result for SHA-256 b76c835aadeed8dd…

MALICIOUS

PDF

82.9 KB Created: 2021-03-14 19:56:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 3ae8a20bff86a124f8a6aad33d61ccb5 SHA-1: 5aa12188de5b971ec54a3e0666cd0c1e9372ac28 SHA-256: b76c835aadeed8ddd80836c5b96334c15168f79d531cc070d97d13a8bdaf4c7f
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, identified as a link farm. Several heuristics indicate this is a malicious SEO or phishing attempt, with ClamAV detecting it as 'Pdf.Phishing.Trojan'. The embedded links likely lead to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://leonvi.ru/strik?utm_term=they+say+i+say+summary+chapter+10 PDF link annotation
    • https://basedupapopulow.weebly.com/uploads/1/3/4/3/134344364/4394263.pdfIn PDF document text
    • http://desokore.medianewsonline.com/46373865047.pdfIn PDF document text
    • https://kawijidaxo.weebly.com/uploads/1/3/4/8/134891868/xudiku.pdfIn PDF document text
    • https://lipuxavevafip.weebly.com/uploads/1/3/1/3/131398459/7104713.pdfIn PDF document text
    • https://marevesebogu.weebly.com/uploads/1/3/0/8/130813877/f9cf58f.pdfIn PDF document text
    • https://rajilogibakew.weebly.com/uploads/1/3/5/3/135326989/e3c9731750034.pdfIn PDF document text
    • https://tojoxuponoseb.weebly.com/uploads/1/3/5/3/135395296/2725322.pdfIn PDF document text
    • https://pefibiwurabamiz.weebly.com/uploads/1/3/0/8/130874510/mewososojapaniw-gufokotaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370089/normal_6013c54e5ac8c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375073/normal_6035e270f33e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406228/normal_602793d764e91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365567/normal_6037e5c443087.pdfIn PDF document text
    • https://fedobakeruja.weebly.com/uploads/1/3/4/3/134367732/63a4fca09c5ef0.pdfIn PDF document text
    • https://pamaxorakumi.weebly.com/uploads/1/3/4/0/134019068/semetuvarijiwimezo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/gofilafixu/html_email_template_builder_free.pdfIn PDF document text
    • http://nukivamo.myartsonline.com/59264694318.pdfIn PDF document text
    • https://s3.amazonaws.com/towakog/how_to_block_calls_on_att_cordless_phone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f621ba39-ea04-424b-bc44-917bd402eabd/gatagudafute.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92bcc997-eff5-4603-883f-0cef813a7554/beziwifobolijovapuzamo.pdfIn PDF document text
    • https://s3.amazonaws.com/kiguteperilodu/81940955344.pdfIn PDF document text
    • http://sijadogif.atwebpages.com/25302551269.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70890431-3016-4f66-a4d7-3a4220c20ae2/what_is_historical_theory_of_law.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B9 5052 bytes
SHA-256: c440a500be5266db345f0336cb4be4477e3c9ebe48c58f5da8c184be8e4571d1
font_01_sfnt_off000108f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F2 11540 bytes
SHA-256: 1c2862c3a42acacbd7f9c0e1192794c516253ec256e217046696dc9177e0291f
font_02_sfnt_off00013008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13008 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378