Malicious PDF — malware analysis report

Static analysis result for SHA-256 0355d1b8491aa65d…

MALICIOUS

PDF

126.2 KB Created: 2021-04-20 13:00:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: cee16542ff9dafc6f7273e3df6f5e9db SHA-1: 270357a07c381f0526743f773ace3ce928f2ed92 SHA-256: 0355d1b8491aa65d69e607c9131893edbf3b1dc2ba45263bc06a366fb6d72d3d
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, indicative of a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect the user to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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/strik?utm_term=how+long+is+the+bereavement+process PDF link annotation
    • http://tosety.xyz/41334234821kjhep.pdfIn PDF document text
    • https://veduwasa.weebly.com/uploads/1/3/1/6/131637496/8693035.pdfIn PDF document text
    • https://gawozigojuvapa.weebly.com/uploads/1/3/4/8/134896601/9346232.pdfIn PDF document text
    • http://zexejodubaxiku.mygamesonline.org/90172721599.pdfIn PDF document text
    • https://kafunonedejo.weebly.com/uploads/1/3/4/6/134662894/vedotowukidip.pdfIn PDF document text
    • https://betetitowuti.weebly.com/uploads/1/3/4/3/134331261/ae75dbd546d7b.pdfIn PDF document text
    • https://xizovetezewo.weebly.com/uploads/1/3/2/8/132814166/dumumawarubo_fexenoxod_durufekut_luner.pdfIn PDF document text
    • http://larebalin.mypressonline.com/89821609819.pdfIn PDF document text
    • http://fadulifakibul.medianewsonline.com/76041491966.pdfIn PDF document text
    • https://papuxivosep.weebly.com/uploads/1/3/4/4/134491017/jebumosiwafek_vefeke.pdfIn PDF document text
    • https://pigokujedaxe.weebly.com/uploads/1/3/0/7/130740563/kekowumenelavolota.pdfIn PDF document text
    • https://nezivubu.weebly.com/uploads/1/3/1/3/131384481/ludizol-tigexovezem-ligeworazu-duziver.pdfIn PDF document text
    • http://helpforteam.com/que_es_el_lenguaje_corporal_segun_autoresb239g.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f26e6bca-ce10-4524-9610-ed5ef7c8d48b.filesusr.com/ugd/ac8c68_cc781de8ee13407fb8e31a657f30379c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rafiralexezol/definition_of_checks_and_balances.pdfIn PDF document text
    • https://d0f5cf02-e55f-42e7-ba97-8a4d5a2b8368.filesusr.com/ugd/7f59a0_b0faee6b6a814240a32f95143432c771.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/14047133250.pdfIn PDF document text
    • https://fa886832-b9e3-4ce5-a98c-97da2614721f.filesusr.com/ugd/9f8050_1b3d7d3632144836838890a75a8b160a.pdf?index=trueIn PDF document text
    • https://78151a86-a557-4e49-81aa-a2539eea45c7.filesusr.com/ugd/204f4f_599f85e977e14f7584a97759e9ae6d69.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_off0001afb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AFB7 5600 bytes
SHA-256: 617d67b51b7a67cd323bdb60e6d53ce054f3ef633d480ad280c3c02116639544
font_01_sfnt_off0001c2b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C2B6 12272 bytes
SHA-256: 808b9ab1f84171d03f97decd9a326fdf37bfcb83e1d7ceda26049f22868f5761

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