Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ab114f372842b2d…

MALICIOUS

PDF

85.1 KB Created: 2021-02-16 11:58:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: f83106acaa52dbc69725e17f2d9cf351 SHA-1: e38c99f7700545f2f485b71bc9204d027d781888 SHA-256: 3ab114f372842b2d51a3ddb5d96b1abc4db6a67a404667cd13379236d492d1fb
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, a common tactic for SEO poisoning and phishing. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of links, and the ClamAV detection 'Pdf.Phishing.Trojan-d2568dad23a94d95-10044375-0' strongly suggests malicious intent. The document body, though partially garbled, contains a URL that appears to be a lure for users searching for information about a 'gota' attack, likely leading to malware or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jottigo.ru/strik?utm_term=cuanto+tiempo+dura+ataque+de+gota PDF link annotation
    • http://baltika-trans.ru/kobrann_ykselii_2_trke_dublaj_izle4s7h8.pdfIn PDF document text
    • https://cdn.sqhk.co/tomubozes/htMcXjh/lidizejebasudivuvo.pdfIn PDF document text
    • http://toleritikujomuj.22web.org/dun_and_bradstreet_commercial_credit_report.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371553/normal_5fe617a68e51f.pdfIn PDF document text
    • http://livethailand.fun/top_10_soundbarsgiilz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419626/normal_60063bbb2cd92.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453338/normal_5fe4c2b9f1a74.pdfIn PDF document text
    • https://cdn.sqhk.co/dojarodawiw/jbzXgfN/sharpening_stone_grinding_wheel.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415544/normal_5fe1806758ae8.pdfIn PDF document text
    • https://pizotiwedif.weebly.com/uploads/1/3/4/8/134868845/9226005.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449187/normal_5ff49de848459.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10004 5100 bytes
SHA-256: e12ac35c5d91bd64c9f5e192db1a13ca6ae5532f4145295985358e31ab762ef8
font_01_sfnt_off0001113a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1113A 12220 bytes
SHA-256: b6b49d8c18bfede50c7e7f8fd22f385acd8f6dbff6fb44af858af097bf50226c
font_02_sfnt_off0001379c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1379C 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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