Malicious PDF — malware analysis report

Static analysis result for SHA-256 3acb63bc3af93a96…

MALICIOUS

PDF

81.6 KB Created: 2021-03-07 11:42:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 31457323aeb59f325e60cfd537cf3e09 SHA-1: 41519963f9538cbafc5fb232f8bac157b45fb515 SHA-256: 3acb63bc3af93a96a2e59490bf67f6df7e9bb698e2d4d2b48891c05a7fb222d1
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful 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://resalured.ru/strik?utm_term=difference+between+ruger+lcp+and+ec9s PDF link annotation
    • http://wefigofozotime.22web.org/asm_metals_handbook_volume_4_-_heat_treating.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445731/normal_5fe8ed59d1c55.pdfIn PDF document text
    • https://vomakitiba.weebly.com/uploads/1/3/1/3/131384058/zumamijolajazaw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447273/normal_5fc905706f1a9.pdfIn PDF document text
    • http://mogoxopedutisaw.iblogger.org/tuxibumewepapafaso.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407064/normal_5ff267d8205a1.pdfIn PDF document text
    • http://jarewitof.mypressonline.com/webuxufasakabufolakonepo.pdfIn PDF document text
    • http://zovofuti.mygamesonline.org/56245422850.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413590/normal_6013c1f323f6d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376599/normal_6007f15044087.pdfIn PDF document text
    • https://guxofoxevi.weebly.com/uploads/1/3/4/7/134737998/79251a9.pdfIn PDF document text
    • https://telewebejuta.weebly.com/uploads/1/3/1/6/131607630/f0b7c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481055/normal_603b3b801761d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5926284e-b61c-4ed0-95e5-27b9feedd2c3.filesusr.com/ugd/50c35f_0e03637babec4199a67442a8618d3d75.pdf?index=trueIn PDF document text
    • http://nakeviw.myartsonline.com/who_was_the_greatest_female_warrior_in_history.pdfIn PDF document text
    • https://2c8134a4-d865-4da1-8961-c755d7242105.filesusr.com/ugd/6dcf04_7cfbaf6cfedd4ea08040997d51c730d9.pdf?index=trueIn PDF document text
    • http://wakoxoxotof.epizy.com/spanish_verb_conjugation_worksheets.pdfIn PDF document text
    • http://mesuwepuru.epizy.com/atoms_molecules_ions.pdfIn PDF document text
    • https://01477de9-116b-42a6-a62c-54244336611e.filesusr.com/ugd/dea9e9_8b04d338add24453ae4d4b23c2ac3901.pdf?index=trueIn PDF document text
    • https://0298dc5a-7924-4276-8279-06452a5288da.filesusr.com/ugd/b30cf0_195bbf98fc9d4465aeddab946ede63ad.pdf?index=trueIn PDF document text
    • https://67dc9804-4028-4298-afd7-d431d2c16fe6.filesusr.com/ugd/559c84_69dca1425fd54190a28629740f220db2.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3F 5712 bytes
SHA-256: af79a84dad3e4ec6829330c8af2ef9abe1be30293898c3701028865ca5d17d44
font_01_sfnt_off000111d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D1 11556 bytes
SHA-256: 3e8bfb99f150135cb2bc9d7cd29c2c62b48fc7980abc1c828e6d3db001343364