Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d102ac859b286c2…

MALICIOUS

PDF

78.2 KB Created: 2021-03-17 09:02:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 02cf626ac1b51d60293761e1f9102565 SHA-1: 72bc3769d9fb4068093298acdc9cf57180c21f56 SHA-256: 6d102ac859b286c2044fa36431dca7bf971c07b54b80180a407f6cc61e5600d9
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm used for phishing or malware distribution. The document body, though heavily obfuscated, contains metadata related to interview schedules, which serves as a lure. No scripts were extracted, but the presence of numerous external URLs is a primary indicator of malicious activity.

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://jumiwimov.ru/award?keyword=interview+schedule+definition+pdf PDF link annotation
    • https://mejapibidar.weebly.com/uploads/1/3/4/3/134315264/9116647.pdfIn PDF document text
    • https://rinotawobuv.weebly.com/uploads/1/3/4/7/134768279/laronek.pdfIn PDF document text
    • https://zodixezujiz.weebly.com/uploads/1/3/5/3/135345824/4764220.pdfIn PDF document text
    • https://vapaniwagivu.weebly.com/uploads/1/3/4/4/134442769/zitomikew.pdfIn PDF document text
    • http://mir23.xyz/primeros_establecimientos_de_alimentos_y_bebidas_en_nicaragua3bgjq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365576/normal_6014b065ebe72.pdfIn PDF document text
    • http://bonmarket.site/jawakifavirabfigd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470400/normal_601d4f3cb7c53.pdfIn PDF document text
    • http://cardioactiveufficiale.site/remington_700_sps_tactical_stock_modificationbd58r.pdfIn PDF document text
    • http://liketime.online/anti_inflammatory_foods_for_autoimmune_disorderi5o4p.pdfIn PDF document text
    • https://zexawowa.weebly.com/uploads/1/3/6/0/136081798/bizopebit.pdfIn PDF document text
    • https://xepevuke.weebly.com/uploads/1/3/0/7/130775471/xisuzewexaxizegarivi.pdfIn PDF document text
    • http://chestlune.online/song_mr_jatt_latestm7uwm.pdfIn PDF document text
    • https://lepekogiba.weebly.com/uploads/1/3/1/6/131637498/d1ead2bf609.pdfIn PDF document text
    • https://lomowurepiv.weebly.com/uploads/1/3/1/4/131437546/1758034.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a44a9d9e-3ce9-422e-9b5d-83ef2d4925cb.filesusr.com/ugd/3234e9_76fd4e0a6e9e4737964629fd93f0f0b4.pdf?index=trueIn PDF document text
    • https://6b54b0b2-91db-43cc-88c8-bbc4f7e20b37.filesusr.com/ugd/a773aa_32c0860418ee49348185e176c4f2f7bf.pdf?index=trueIn PDF document text
    • https://3e1ae61b-6b68-46dc-8a90-d1c7a5b9f91c.filesusr.com/ugd/b8bbd7_2c5ed793591142b09476937e8e1274f6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tesasubawalozan/guided_reading_questions_for_poetry_ks1.pdfIn PDF document text
    • https://s3.amazonaws.com/xeponodij/sheet_metal_bead_roller_dies.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_off0000f4a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A5 5124 bytes
SHA-256: ae682b538381c596958a80f0da4eb9066ed077c30f6a6ccce68c9da418d23524
font_01_sfnt_off00010626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10626 11104 bytes
SHA-256: 0bb5249ab04f83d4ae2cd4222596a58ce556f4ce1af1349f7613f473f3ee3816