Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5747c347fc8ac12…

MALICIOUS

PDF

79.3 KB Created: 2021-04-27 19:40:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: afd4786a98f7f44fcb2babe2664d0967 SHA-1: d909f598623a58118882ad1de25b67b063160b9b SHA-256: a5747c347fc8ac12d1a1cecdc835f4e7e00ff6a7880c69af976eec9407d23587
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, characteristic of a link farm or SEO spam operation. The embedded URL 'https://seumenha.ru/strik?utm_term=how+to+clean+my+keurig+filter' suggests a lure to attract users searching for specific information. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification, likely involving phishing or redirection to malicious content.

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://seumenha.ru/strik?utm_term=how+to+clean+my+keurig+filter PDF link annotation
    • https://cdn.sqhk.co/fikalibumi/iiidggi/garrard_401_plinth_template.pdfIn PDF document text
    • https://cdn.sqhk.co/wuwoxegolewa/gew8Jhd/57902639333.pdfIn PDF document text
    • https://mukoxawav.weebly.com/uploads/1/3/4/6/134627731/novatezas.pdfIn PDF document text
    • https://tagakokiginozol.weebly.com/uploads/1/3/0/7/130775172/778f9af0c.pdfIn PDF document text
    • https://rebejudan.weebly.com/uploads/1/3/5/3/135316845/rumoruji.pdfIn PDF document text
    • https://xakirajurupani.weebly.com/uploads/1/3/2/3/132303083/33e6d18f.pdfIn PDF document text
    • https://luwagibefex.weebly.com/uploads/1/3/5/9/135966535/3277188.pdfIn PDF document text
    • https://senovaxevuka.weebly.com/uploads/1/3/5/3/135304629/070d3.pdfIn PDF document text
    • http://tadinos.22web.org/how_to_remove_door_rubber_on_lg_washing_machine.pdfIn PDF document text
    • http://nikositukiwufez.iblogger.org/70895646770.pdfIn PDF document text
    • http://jepowoxudo.iblogger.org/besoroxatunulekevad.pdfIn PDF document text
    • https://cdn.sqhk.co/rujiwujik/bAVhfBC/64974907188.pdfIn PDF document text
    • https://fozirufimagez.weebly.com/uploads/1/3/0/9/130969558/luzitolorajuba.pdfIn PDF document text
    • https://cdn.sqhk.co/tawunipufop/diaS8if/5_seconds_of_summer_wildflower_live.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kugovede.epizy.com/28502323238.pdfIn PDF document text
    • https://d0fd22f1-78bd-4368-960d-2a324028b2bb.filesusr.com/ugd/a4d998_d6e003c673df4436add7a22609bd4460.pdf?index=trueIn PDF document text
    • https://2c5a832e-93c4-4ab0-bef0-969ef348d747.filesusr.com/ugd/cc5daa_f6a2b45945cf4130801fa6746dd1c3f5.pdf?index=trueIn PDF document text
    • https://a7176590-a44a-43b4-8b25-1171fb6190ac.filesusr.com/ugd/e6ccb8_110785cf9495448180878e42885fdfd5.pdf?index=trueIn PDF document text
    • https://235a1a37-2bc9-4d3b-8f1d-d3952ad9fba8.filesusr.com/ugd/3111f7_cf007624a5a144bc890bf4f546c122f6.pdf?index=trueIn PDF document text
    • http://mivevusewez.epizy.com/aristotle_philosophy_summary.pdfIn PDF document text
    • http://zakuvusebaj.epizy.com/distributive_property_worksheet_for_5th_grade.pdfIn PDF document text
    • https://e209d09f-5af8-48a0-acfc-72d03e9bea0d.filesusr.com/ugd/946fcc_d60170cd6a844d928231a800d1f3b13d.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_off0000f6e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E3 5244 bytes
SHA-256: bf5b117097b4b85200b726f8c6ee6004a527620ee8b4e3c5f37c182a96c66671
font_01_sfnt_off000108c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C6 10940 bytes
SHA-256: 7bb5d53b0e631adc8dad38f617965ab07a69e552405bfb3cc102ccc8c01c547f