Malicious PDF — malware analysis report

Static analysis result for SHA-256 d610aa4328e0e30d…

MALICIOUS

PDF

78.8 KB Created: 2021-03-25 10:22:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3659f45af29ae79d5fe8ea2d8079a62 SHA-1: b5459357176d2fd7332c41453e4ebafab0cce030 SHA-256: d610aa4328e0e30da942fafcc2acedaaa5d5356e7ff5e8b5bd6a886844df2558
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, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, which is not typical for legitimate documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/123?utm_term=current+trends+in+human+resource+management+pdf
    • https://cdn-cms.f-static.net/uploads/4425728/normal_601dbe5438728.pdf
    • http://hurricane1.space/it_2nd_line_support_interview_questionsbgn3o.pdf
    • https://tamidotojo.weebly.com/uploads/1/3/1/8/131858916/b300d985548.pdf
    • https://jijixedo.weebly.com/uploads/1/3/1/3/131398351/d910a2e.pdf
    • http://apsmall.space/509164248548u4ag.pdf
    • https://zabaruwizugode.weebly.com/uploads/1/3/4/5/134596412/datag.pdf
    • http://dk-inc.xyz/wisusavutoryhxum.pdf
    • http://bostpolamos.site/nefisegosomijixisydlx3.pdf
    • http://5-euro.info/gugoluxogajofe0u5js.pdf
    • https://nukivobiwej.weebly.com/uploads/1/3/4/0/134016752/dezerobunovi.pdf
    • http://prizyivnik.ru/phonak_brio_4_b-13ez5te.pdf
    • https://xiforamuti.weebly.com/uploads/1/3/4/6/134611992/jutilovolisidab.pdf
    • https://cdn-cms.f-static.net/uploads/4478923/normal_6045c87cd6045.pdf
    • http://linza.media/carrier_weathermaker_9200_flame_sensor413p4.pdf
    • http://bazis-rostov.com/clarissa_stefan_zweigujv8q.pdf
    • https://jotavitot.weebly.com/uploads/1/3/0/7/130738821/de606554b4e0.pdf
    • https://cdn-cms.f-static.net/uploads/4417830/normal_60312ee63a6a7.pdf
    • https://wofiwajelakezod.weebly.com/uploads/1/3/6/0/136092853/5921868.pdf
    • https://static.s123-cdn-static.com/uploads/4451035/normal_5fed515fcafe1.pdf
    • https://cdn-cms.f-static.net/uploads/4455883/normal_6034bfee9038e.pdf
    • https://jufesuzukexo.weebly.com/uploads/1/3/5/2/135294717/ca203c66.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://2df275fc-a8dd-466e-be95-33fe0afe7bed.filesusr.com/ugd/9b6d1e_5b9f7d2220d94a658da1a14c8a81bbed.pdf?index=true
    • https://9db8f275-5044-409a-aa1b-3306d9dda9bd.filesusr.com/ugd/361f4b_037a092e85d24d1bbdbfe5d907048ee7.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_off0000f5ab.bin
5b0559ef2f3dd4b8873a8acf8d0fee4a5ebc3654e2fa1d70060d06f57253806b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AB 5440 bytes
font_01_sfnt_off000107ff.bin
96c8ae3f3dfbb4f6522d8fde5d1e2d9298e6c3964bcdf4deb9e5881862fa3599		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107FF 10988 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.