Malicious PDF — malware analysis report

Static analysis result for SHA-256 615f4037e143db26…

MALICIOUS

PDF

66.4 KB Created: 2021-02-16 10:41:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 37c67c1eef015d33b6783d165ba59ed9 SHA-1: ceea07cc1cf9fffa18a8552c5fd8903adcf2ff07 SHA-256: 615f4037e143db2675a246eaec408b59c9a548b21b3514fb606a648bd3f37519
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The embedded URLs and the overall structure point towards a phishing or SEO poisoning attack.

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://druttle.ru/wb?keyword=how%20to%20clean%20filter%20samsung%20front%20load%20washer PDF link annotation
    • https://cdn.sqhk.co/mowogibewu/hjajgha/lumuxegujisif.pdfIn PDF document text
    • https://cdn.sqhk.co/rasepotobami/4ibWuii/ritog.pdfIn PDF document text
    • https://cdn.sqhk.co/mudifuto/hjhaNge/16895037770.pdfIn PDF document text
    • https://xubivotalo.weebly.com/uploads/1/3/0/7/130775972/figusutasonul-muperewomuj-tapozeje.pdfIn PDF document text
    • http://relax35.ru/famafekemrder.pdfIn PDF document text
    • https://cdn.sqhk.co/kululojilo/Egcuhff/lunaxagasamup.pdfIn PDF document text
    • https://cdn.sqhk.co/zegofurop/hc2gj4s/battleground_s_survivor_battle_royale_pc.pdfIn PDF document text
    • http://paksorond.xyz/14414484697e04ax.pdfIn PDF document text
    • https://cdn.sqhk.co/tarudifirew/hfpjfJD/vusegexanunirodel.pdfIn PDF document text
    • https://nububoreral.weebly.com/uploads/1/3/4/4/134467099/d8810ebb0b.pdfIn PDF document text
    • https://cdn.sqhk.co/mafowixodi/lZhhjhu/mudding_four_wheelers_4x4.pdfIn PDF document text
    • http://urott-hu.com/fijonogimabunowugaxakepum9yjx.pdfIn PDF document text
    • https://fosovumukudire.weebly.com/uploads/1/3/4/2/134235423/wolopixepu_deloxepaxopenu_jokumijunagege_duwafavev.pdfIn PDF document text
    • https://cdn.sqhk.co/toxinize/hoH1GgP/rocket_league_racing_game.pdfIn PDF document text
    • https://badosajag.weebly.com/uploads/1/3/1/4/131407507/9626737.pdfIn PDF document text
    • https://cdn.sqhk.co/savunowudob/jUoMhdz/guess_the_song_emoji_2020.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000c7f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F2 5488 bytes
SHA-256: 77a26d1744e1ec09041a748da4f43044b6cb78f96c4c0af09c33f9f4a1dffc95
font_01_sfnt_off0000da83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA83 9936 bytes
SHA-256: 29cd2aadb11318b54dc5a9839d65f16f06baeb7dbb2e1d94aa53506a63276ac9

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