Malicious PDF — malware analysis report

Static analysis result for SHA-256 60a5a2bfbf94a213…

MALICIOUS

PDF

69.7 KB Created: 2021-02-19 21:03:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 846d293be8c62a1030c13de59fc35b15 SHA-1: dcbcd0e35d59541f0dc7bb96a74693de98b26ac9 SHA-256: 60a5a2bfbf94a2138b2aaff6352745e0527bbaf470c8861a5f74aa7908294c5c
214 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, and contains multiple links to known malicious redirector infrastructure. The document body, though partially corrupted, suggests a lure related to 'worksheet answers', indicating a phishing or scam attempt. The presence of numerous external PDF links further supports the classification as a link farm designed to distribute malicious content.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=introduction+to+the+plant+kingdom+worksheet+answers In PDF document text
    • https://cdn.sqhk.co/genamudazunu/8icib6f/97929715545.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382965/normal_5fe93854907c9.pdfIn PDF document text
    • https://bewirupudafa.weebly.com/uploads/1/3/1/6/131607000/fopagafimowo.pdfIn PDF document text
    • https://cdn.sqhk.co/rifojimuna/gjigdgg/nail_art_ideas_for_halloween.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453537/normal_5fe1029e7cda0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421048/normal_5ff26a744d056.pdfIn PDF document text
    • https://cdn.sqhk.co/kolokejo/cib2if5/xelaxojoniraluvisiber.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407318/normal_5fdc24ace6413.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414869/normal_5ffd5e57a1fcb.pdfIn PDF document text
    • https://cdn.sqhk.co/dolafita/AOjhnhj/caregivers_of_america_honesdale_pa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xajowu/aarambam_movie_songs_telugu.pdfIn PDF document text
    • http://mipivazub.epizy.com/sheet_metal_cutter_for_drill.pdfIn PDF document text
    • http://redariwim.rf.gd/drakor_search_www_batch.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d41f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD41F 5580 bytes
SHA-256: af2e8e78020db00410869aa6673b2b987a108cc2d9d2491ea8b5dea636ab4174
font_01_sfnt_off0000e6fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FE 10116 bytes
SHA-256: ff7c487c0eece84584e8786d30f6ad0e8f79fe815e04863217929ca4b845ebd7

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