Malicious PDF — malware analysis report

Static analysis result for SHA-256 c94e21fd64eec557…

MALICIOUS

PDF

100.1 KB Created: 2021-03-15 08:48:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b53de42119598a3df3cbe9f330c45504 SHA-1: b48ffd771a3ae89678880079b2a03464c98d8a26 SHA-256: c94e21fd64eec55794964fb56012c329de17812c315a166c0c9fcee33953e14f
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF that contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers flagged it as malicious, specifically as a phishing trojan. The presence of numerous external links suggests a potential for directing users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xajibur.ru/wix?keyword=skyborn+altar+chest PDF link annotation
    • https://cdn.sqhk.co/kufalavoxig/fngijZL/last_shelter_survival_cheats_diamonds.pdfIn PDF document text
    • https://sofusetagiwubok.weebly.com/uploads/1/3/4/3/134320735/nogidalaxiwi_gadixadoluniv_woxixokarulugop.pdfIn PDF document text
    • https://cdn.sqhk.co/sevigexew/Cl2xwjj/bebakojijugumezexutotesip.pdfIn PDF document text
    • https://kefexogutifega.weebly.com/uploads/1/3/5/3/135309882/nusinufagimi.pdfIn PDF document text
    • https://cdn.sqhk.co/roxirali/bDhhaG0/benedict_cumberbatch_hamlet.pdfIn PDF document text
    • https://lelopotive.weebly.com/uploads/1/3/0/7/130738546/5208866.pdfIn PDF document text
    • https://kipujoguburaza.weebly.com/uploads/1/3/4/3/134321983/razusomal.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxiropuwomo/cUkhcw3/aptitude_short_tricks_free.pdfIn PDF document text
    • https://cdn.sqhk.co/kexofodatop/iohfihD/nogilavovobe.pdfIn PDF document text
    • https://pafebexazare.weebly.com/uploads/1/3/1/1/131163914/db200ef0242c2.pdfIn PDF document text
    • https://vuzowukuz.weebly.com/uploads/1/3/0/8/130814197/5584347.pdfIn PDF document text
    • https://pasezarovatif.weebly.com/uploads/1/3/4/8/134858127/3fcefa9.pdfIn PDF document text
    • https://cdn.sqhk.co/lusoxepero/fhchgEq/top_rechargeable_batteries_aa.pdfIn PDF document text
    • https://cdn.sqhk.co/mogowepuw/qAUjhhh/53864726159.pdfIn PDF document text
    • https://luzusuzure.weebly.com/uploads/1/3/0/7/130775685/finijugek_selorimoxafuzu.pdfIn PDF document text
    • https://cdn.sqhk.co/nisisepolo/9jjeHie/zefonikogijepi.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://425e2ee7-996f-4c6d-a593-b44a2a39b733.filesusr.com/ugd/bb05c1_397f4cb23e5e4334abc8df88c35988e1.pdf?index=trueIn PDF document text
    • https://5849b288-062f-49f8-a71b-da420f1f00fd.filesusr.com/ugd/c068f8_1ad1388d3661431a82d85e14945530eb.pdf?index=trueIn PDF document text
    • https://6ec3981f-6443-463b-a164-91fc69f101d9.filesusr.com/ugd/7603ae_f683c61a7f7e417b8c4ad283fb9a219e.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013a1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A1D 5036 bytes
SHA-256: 30631333368e1c0f06e2839c41369e2587159d17d970f0424f665e2f8682c5aa
font_01_sfnt_off00014b2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B2D 12780 bytes
SHA-256: 0eb809ef124a6684f043009e8f5486c07d743c0e45188024b538a2bcc476f155
font_02_sfnt_off00017572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17572 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2