Malicious PDF — malware analysis report

Static analysis result for SHA-256 558aa4b93cf0b083…

MALICIOUS

PDF

77.5 KB Created: 2021-01-10 00:54:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: b70576a08d4b3023ac5935550ba4c308 SHA-1: 76ae0c2e45b1fe441016ba375d2589e6d4a4e98e SHA-256: 558aa4b93cf0b0831a8d0b7adce1c47d574e0c30606ba9c5a74c9af972705911
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous external URIs, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains references to '2 digit addition with carry over worksheets', likely a lure to disguise the malicious intent.

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 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://trafficel.ru/aws?utm_term=2+digit+addition+with+carry+over+worksheets PDF link annotation
    • https://cdn.sqhk.co/nuxoporerom/A5hgztz/fairy_party_ideas_for_4_year_old.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407060/normal_5f93925a8171d.pdfIn PDF document text
    • https://site-1172792.mozfiles.com/files/1172792/83188636111.pdfIn PDF document text
    • https://site-1166701.mozfiles.com/files/1166701/komen.pdfIn PDF document text
    • https://site-1175435.mozfiles.com/files/1175435/botugusevobovufagux.pdfIn PDF document text
    • https://site-1201629.mozfiles.com/files/1201629/pajuxitigevotat.pdfIn PDF document text
    • https://revixapega.weebly.com/uploads/1/3/4/6/134619396/f6992bf65a2fba.pdfIn PDF document text
    • https://rogenogenitel.weebly.com/uploads/1/3/4/3/134316557/domugubigawo.pdfIn PDF document text
    • https://site-1174586.mozfiles.com/files/1174586/redskins_colors_yarn.pdfIn PDF document text
    • https://zomanuvid.weebly.com/uploads/1/3/4/4/134477829/naset_sapazi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475389/normal_5ff3f422da598.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_off0000e59c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59C 5312 bytes
SHA-256: ff8c36f95a30459d12237c507ad369232fb13bfad11f7ff33e93b466e05e3a5b
font_01_sfnt_off0000f7b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B0 10268 bytes
SHA-256: 66e36b3f077b7cb5db797226aa621ed64a9d55a0cf0c73060a754638b31c6b80
font_02_sfnt_off00011a98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A98 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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