Malicious PDF — malware analysis report

Static analysis result for SHA-256 b50a84bbda88fc9b…

MALICIOUS

PDF

78.9 KB Created: 2021-04-24 04:50:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9ca10e44e204961ab8d9800773405656 SHA-1: ca210dc9f75dcd9e819178c2831fdce5a18bbfe0 SHA-256: b50a84bbda88fc9b5daecb69e198a573624e6460b2b846c257e8cccfe6d0ada8
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://pelibifir.ru/strik?utm_term=best+daily+devotions+for+dating+couples PDF link annotation
    • https://fojefutitamok.weebly.com/uploads/1/3/3/9/133989463/juxutisifowo-sugukisux-bezijaturo-pasibobuguxix.pdfIn PDF document text
    • https://pilidikuvitas.weebly.com/uploads/1/3/4/7/134766888/9411739.pdfIn PDF document text
    • http://vubunojetufofi.iblogger.org/mathematical_physics_for_msc.pdfIn PDF document text
    • https://feriwixuwegixuf.weebly.com/uploads/1/3/4/6/134602873/napegoxi_velupiwu_dipupojuso_foxekopaguxa.pdfIn PDF document text
    • https://voxaxaloxedifuz.weebly.com/uploads/1/3/5/3/135399296/magovujovebo_ripaxo_sanadopagafaji.pdfIn PDF document text
    • http://rizaloripejo.iblogger.org/formule_semi_dveloppe_de_l_ammoniac.pdfIn PDF document text
    • https://finudekenituw.weebly.com/uploads/1/3/6/0/136053274/sazewabulaxawabotuzi.pdfIn PDF document text
    • https://liwavijej.weebly.com/uploads/1/3/4/3/134379327/wanisunirubi-tevuzoz.pdfIn PDF document text
    • https://mutikotamibe.weebly.com/uploads/1/3/0/8/130874320/1480480d5f7532.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ff9dba89-6132-4485-99c2-ace8a2453124.filesusr.com/ugd/c3f59f_00687e2b279949c4bf1dbed2e962875b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dotivaf/28815117849.pdfIn PDF document text
    • https://3d1db4d0-c196-4dd3-8d5c-bb108cafbd43.filesusr.com/ugd/479e38_4b450227bc224920837890d382f618cb.pdf?index=trueIn PDF document text
    • https://62dace35-232c-43a2-b3e8-6cf19ad57148.filesusr.com/ugd/42ae31_396ca328485a4a13b59b36416b3101b8.pdf?index=trueIn PDF document text
    • https://1f571a09-6495-4108-bd1a-9715deae29b5.filesusr.com/ugd/b0bf26_df51566b42e84ad9832b7502c88f84d3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ziwuvijevo/afb_staining_procedure_for_sputum.pdfIn PDF document text
    • https://s3.amazonaws.com/wajibile/27709244341.pdfIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/afinidades_eletivas.pdfIn PDF document text
    • https://cc968bdf-8a18-4a65-a72d-893c706ef441.filesusr.com/ugd/bae363_a6408cbe1dd0414a95fbb7f4bc534b8d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gurafoga/fenowedenivofexejoli.pdfIn PDF document text
    • https://s3.amazonaws.com/pexodugosa/7th_heaven_season_9_episode_guide.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_off0000f4f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F8 5532 bytes
SHA-256: ef5ae228750e5a4fb5cf98062cb84721529ba930cc9d8d9f34cacd24402eb2e8
font_01_sfnt_off000107f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F6 10956 bytes
SHA-256: 25c42716684cf5d989267505573080aa35bf58abd3471d55c78ff596f3303465

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