Malicious PDF — malware analysis report

Static analysis result for SHA-256 0754c267a322aab3…

MALICIOUS

PDF

78.5 KB Created: 2021-03-30 23:01:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 2813674fed002abb0b026e281fbe21e2 SHA-1: c6dff98bdc4d0f29dd77b29ad3034e717364b80e SHA-256: 0754c267a322aab3bed2fe6e9ae2c56cd6f44a12441f2d8002843605859172a2
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for link farms used in phishing or to distribute malware. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, with 'PDF_SEO_DISPOSABLE_LINK_FARM' further suggesting malicious intent due to disposable hosting. The ML classifier and ClamAV detection strongly indicate maliciousness. Although no scripts were explicitly extracted, the nature of the link farm and the presence of external URLs suggest an attempt to redirect users to malicious content.

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://xajibur.ru/wix?keyword=history+alive+the+ancient+world+study+guide+answers PDF link annotation
    • http://mixezitubut.mygamesonline.org/94242857864.pdfIn PDF document text
    • https://suzeziji.weebly.com/uploads/1/3/0/7/130739492/rikukaxizozu-jeguguse.pdfIn PDF document text
    • http://tuzogat.sportsontheweb.net/56336499531.pdfIn PDF document text
    • https://cdn.sqhk.co/putizimetiwe/e2jjA1r/36679565351.pdfIn PDF document text
    • https://vufuredupe.weebly.com/uploads/1/3/0/7/130776381/8600031.pdfIn PDF document text
    • https://dojibosuxuzepi.weebly.com/uploads/1/3/1/3/131378780/bfc7971340c.pdfIn PDF document text
    • https://cdn.sqhk.co/giwitosak/Xjigcif/ayesem_koti_song.pdfIn PDF document text
    • https://dakubazelup.weebly.com/uploads/1/3/1/4/131454222/1851334.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/96db7d3d-3df2-4eb4-afa9-1f7c08aff991/71651108370.pdfIn PDF document text
    • https://21a67f6d-2aea-439f-a910-ed4feb6be009.filesusr.com/ugd/173616_90ef3e6b88f84f41960ee7d3fd707ea8.pdf?index=trueIn PDF document text
    • https://24218389-b518-4ca3-8548-65eaf758daa4.filesusr.com/ugd/c836c3_5658b7c09c8345b5b09b0a2c1552174e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f03ec8bd-8c2d-4028-8222-2c5989480564/21707969601.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2e6890b-a9f9-4644-a09a-c31eb151930c/what_do_guys_like_to_hear_from_a_girl_when_texting.pdfIn PDF document text
    • http://jelenaw.myartsonline.com/mathematical_statistics_with_applications_7th_edition_solutions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c59dfa1-fb26-4848-8a3b-64ed88a9008d/tamapateguse.pdfIn PDF document text
    • http://gixarewujedel.atwebpages.com/2609791315.pdfIn PDF document text
    • http://gudukiderunusu.myartsonline.com/linezelerobo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4de33f5-701c-46a6-9cae-56e18e95df78/pevebibavipunolon.pdfIn PDF document text
    • https://09ec27ad-13b2-4d6a-9bba-a73d40af2dac.filesusr.com/ugd/309646_ae379b88fcd741ee95415df3c0149093.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_off0000f450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF450 5416 bytes
SHA-256: 721c2df085e3e86fcfae2f54d35c5dc60921982b23f3d35ffeb0a0f1dcd2b9ed
font_01_sfnt_off000106cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CD 10896 bytes
SHA-256: b0c42d00eed1aef9fbbc5e8019b88984d7f3e96f81c4c6ac879bc88658c7dfe5