Malicious PDF — malware analysis report

Static analysis result for SHA-256 f52593b6275b58b3…

MALICIOUS

PDF

81.0 KB Created: 2020-12-22 19:05:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 5cf806f3abc3aae4b68dd1e540815a11 SHA-1: 780416a03205d33567348747179bcdc832b07790 SHA-256: f52593b6275b58b3947a1cf19c1785c575f03efb1bd02dc80a19345a7f772ebb
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, with one prominent URL pointing to 'traffnew.ru' which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a lure related to 'logarithmic equations worksheet precalculus', indicating a potential attempt to trick users into downloading malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://traffnew.ru/123?utm_term=logarithmic+equations+worksheet+precalculus PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4487424/normal_5fc85a6c9de49.pdfIn PDF document text
    • https://dejalujufoleto.weebly.com/uploads/1/3/1/3/131378776/7837021.pdfIn PDF document text
    • https://liwobolavus.weebly.com/uploads/1/3/4/1/134131542/vuwikafuguvozo.pdfIn PDF document text
    • https://numuzobiw.weebly.com/uploads/1/3/4/5/134589566/baxuxag.pdfIn PDF document text
    • https://xumogimunosu.weebly.com/uploads/1/3/1/6/131607683/a73cbec3e716.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461495/normal_5fca5b734d1b0.pdfIn PDF document text
    • https://kirorasonosa.weebly.com/uploads/1/3/4/7/134743937/5507328.pdfIn PDF document text
    • https://dofazodasi.weebly.com/uploads/1/3/0/8/130873943/4539258.pdfIn PDF document text
    • https://sevivuninuk.weebly.com/uploads/1/3/4/4/134459749/vapoxunugukut.pdfIn PDF document text
    • https://gepavemu.weebly.com/uploads/1/3/4/8/134861499/eda68c4d1b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc5a4096b97992eb57be95c/t/5fd6ebeb313c42342ba18426/1607920619873/facebook_monetization_appeal_form.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf4d813485235c86bcc7c8/1606372740863/43045397762.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb768d0f-420b-428f-baac-4bdec30de107/revolutions_of_1830_and_1848_worksheet.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_off0000f0e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E6 3120 bytes
SHA-256: 016562535695261fa949c20e037b245f776ea9462a3ec0c9e1c8d7b66b64eb05
font_01_sfnt_off0000fc19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC19 5572 bytes
SHA-256: 3c41f98278cc7c1372bec00d639bf3e8194b489c25a8224b31df370d504ad99e
font_02_sfnt_off00010efe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EFE 11608 bytes
SHA-256: db5c7dbdd6230b013ca427454b1d929ccd99965157d79150ddb9f7c99565fd81

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