Malicious PDF — malware analysis report

Static analysis result for SHA-256 deb5b5ba9b14ef03…

MALICIOUS

PDF

86.3 KB Created: 2021-02-23 06:31:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 2f1d097cec7db87d1df5a610f702bbb4 SHA-1: 9228f13a05e2f108fd27e7b544cb94f8ed2bc1c3 SHA-256: deb5b5ba9b14ef03ce24aff512926bbd5f21cdc91bf83f56faa05a0905f536f3
156 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The primary external link points to a URL that appears to be part of a link farm or phishing campaign. While no scripts were explicitly extracted, the presence of numerous external links and the ML classifier's high confidence score suggest malicious intent, likely for phishing or SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/strik?utm_term=how+to+change+the+battery+on+an+armitron+watch PDF link annotation
    • https://letotanuvimipe.weebly.com/uploads/1/3/4/5/134598603/30eb998d3.pdfIn PDF document text
    • https://lulofaki.weebly.com/uploads/1/3/1/4/131453598/7124382.pdfIn PDF document text
    • https://nawexolaka.weebly.com/uploads/1/3/4/7/134704757/e0f84c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448339/normal_600ed6d84b44a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451019/normal_60283b4b3327a.pdfIn PDF document text
    • https://gibiboxovozigux.weebly.com/uploads/1/3/4/7/134722082/botosajow.pdfIn PDF document text
    • https://tawusizigegik.weebly.com/uploads/1/3/3/9/133997505/9611368.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412757/normal_60196830abb72.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
    • https://s3.amazonaws.com/kizugokofo/the_lottery_analysis_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/xozeb/15580718129.pdfIn PDF document text
    • https://s3.amazonaws.com/wovugi/solidworks_2019_64_bit.pdfIn PDF document text
    • https://s3.amazonaws.com/sepovutapakogaf/toxicwap_movies_2018_acrimony.pdfIn PDF document text
    • https://s3.amazonaws.com/wipotegadodorek/rutudonevivirabulenozujub.pdfIn PDF document text
    • https://s3.amazonaws.com/vajefam/58663216663.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10780 5084 bytes
SHA-256: 247a6afd0fd481f85ca4a608aa7ef2ecfd4e199c3334904fd0dc358cccb52b65
font_01_sfnt_off000118aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118AA 10960 bytes
SHA-256: ede1959de1034237c61424ed74b360420c4d21bb45243c5039abad66f09bc877
font_02_sfnt_off00013dc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DC3 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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