Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0cfcb88f1ffaeb2…

MALICIOUS

PDF

83.5 KB Created: 2021-04-01 23:11:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 664ce274aad7b0898f23419ae47528f9 SHA-1: e4015ef51b99eea38e2cc75fa69dea09f8918ab3 SHA-256: a0cfcb88f1ffaeb2ad19257cc1396af4ecfee050ad196fd0de67d55939f9c281
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The file contains a link farm with 30 external PDF links, many hosted on disposable domains, suggesting a phishing or SEO manipulation scheme. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics indicate a likely attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://gimoguvi.ru/123?utm_term=barrows+magic+guide+osrs PDF link annotation
    • http://petersikdar.com/912935918224szub.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470689/normal_5fcc9e46aaab9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489411/normal_602fb0616b389.pdfIn PDF document text
    • https://wuzikixow.weebly.com/uploads/1/3/0/7/130775075/1623938.pdfIn PDF document text
    • http://martakkord.ru/how_many_stitches_is_an_embroidery_machine_good_fore6dhf.pdfIn PDF document text
    • https://tavutapakewig.weebly.com/uploads/1/3/5/3/135399939/3197611.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4529024/normal_5fe4b40b82c1d.pdfIn PDF document text
    • http://medyahanem.com/best_sewing_machine_singer_4423n6v5y.pdfIn PDF document text
    • https://zubosevofugojat.weebly.com/uploads/1/3/4/3/134307347/1555041.pdfIn PDF document text
    • http://koduxipib.iblogger.org/nogomijakagogosexori.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370087/normal_6037d8cf7540e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503214/normal_5fc6b8cca4067.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369797/normal_6014a3aa870d0.pdfIn PDF document text
    • https://xifisipur.weebly.com/uploads/1/3/1/0/131069870/nufifadefizijo_dotevizosaso_xemowadixijored.pdfIn PDF document text
    • https://penatiwateli.weebly.com/uploads/1/3/4/6/134617533/pepilenuseke-gonujat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454435/normal_601ae443f3740.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417662/normal_603c24d258d0f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7133fc40-0b9c-4701-b953-e7fafc934b44.filesusr.com/ugd/70a38d_bd3b8278b3f74535b3e2bfc2f96df34d.pdf?index=trueIn PDF document text
    • https://d99c26cc-8c68-456d-a039-1a26994c8d26.filesusr.com/ugd/105a8c_da81afa7a0064af9aefcd7691bfb6619.pdf?index=trueIn PDF document text
    • https://196cdf53-7a38-4f80-8f5e-3ad65c24f50e.filesusr.com/ugd/e5a593_b524df003c8a4b8e89f0e775bf04be97.pdf?index=trueIn PDF document text
    • https://3ced707c-20bd-49bb-93f1-edb15be4e391.filesusr.com/ugd/e90305_eff32d1eedf74d76bbb74cb6126ee28c.pdf?index=trueIn PDF document text
    • https://98be45bc-63b9-4117-aff7-84a3d4f2c4a0.filesusr.com/ugd/90c678_cb2d8f88f1f043f9b745db23681541ad.pdf?index=trueIn PDF document text
    • http://telenusu.epizy.com/bethel_music_audio_songs.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_off0001084f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084F 5368 bytes
SHA-256: d87d94ad010b5ea36b263c931d797b4ccc6903c82ff4bf413bc9416f9852f5cb
font_01_sfnt_off00011a8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A8E 11036 bytes
SHA-256: 14683a42d31257951a6364159176bcc9dc0c4293b505bbe6a73b89efa36e4ee8