Malicious PDF — malware analysis report

Static analysis result for SHA-256 d17bac21761d2b85…

MALICIOUS

PDF

74.5 KB Created: 2021-03-24 22:53:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 88ac70787cff35516e680b9228a2f682 SHA-1: a162c2632f1fc10d38e422414c8c8a1ae00be98b SHA-256: d17bac21761d2b8519ebaf8b25000c18d9527b2e4c49b3375e287e6f1d6125f5
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. These links point to various domains, many of which appear to be disposable or used for link farming. The ML_NYX_PDF_MALICIOUS heuristic and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware through these links. The document body itself is heavily obfuscated and contains metadata related to its creation, but the primary malicious activity is the distribution of external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mezovuduw.ru/123?utm_term=instinct+tv+series+episode+guide PDF link annotation
    • http://dejivuxa.mygamesonline.org/90141689178.pdfIn PDF document text
    • http://felagem.getenjoyment.net/67117662845.pdfIn PDF document text
    • http://wusator.mygamesonline.org/tango_albeniz_guitar.pdfIn PDF document text
    • http://onlinekartiadesi.com/xezav6hoyw.pdfIn PDF document text
    • https://wufisosudima.weebly.com/uploads/1/3/0/8/130874090/mifabewa.pdfIn PDF document text
    • http://eyebrowthreadingdallastx.com/nutanix_hyper_converged_infrastructure8868v.pdfIn PDF document text
    • https://watogovujun.weebly.com/uploads/1/3/4/6/134626060/d1e32fd43d7ca7.pdfIn PDF document text
    • https://tokoposejod.weebly.com/uploads/1/3/1/3/131380771/796c3bd9.pdfIn PDF document text
    • https://vabiwedewu.weebly.com/uploads/1/3/0/8/130813601/xusijuramewivupifo.pdfIn PDF document text
    • http://tersq.space/79854277524cdryc.pdfIn PDF document text
    • https://rajajedoweji.weebly.com/uploads/1/3/4/3/134310645/8974479.pdfIn PDF document text
    • http://laribij.scienceontheweb.net/defending_jacob_novel_by_william_landay_ending.pdfIn PDF document text
    • http://vowewudimo.mypressonline.com/how_to_export_garageband_to_wav_ipad.pdfIn PDF document text
    • http://filanion.online/rigavoguforiwajejasefugoxm57yh.pdfIn PDF document text
    • https://ninafaguri.weebly.com/uploads/1/3/4/5/134592808/wirodivu_mirawusul.pdfIn PDF document text
    • http://tesekal.mygamesonline.org/how_much_is_big_tom_worth.pdfIn PDF document text
    • http://zomoxoxuriw.mypressonline.com/basquetbol_reglas.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tanikanaw/70004585753.pdfIn PDF document text
    • https://s3.amazonaws.com/falevi/all_algebra_rules.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_off0000e41f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41F 4996 bytes
SHA-256: 40dcb5f6c5a45fb4c9672cc1370050d29bca6511b3a7760904e8cbce82e689a1
font_01_sfnt_off0000f539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF539 11188 bytes
SHA-256: 7f874cca5f850ce24c2f6c34d43e8acacbb1ffada2c6cb3e1d80ce574d75930f

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