Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff560e6c4e8b95c6…

MALICIOUS

PDF

72.8 KB Created: 2021-03-23 01:27:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 37edfbc22c794570b6eb039304f88ec1 SHA-1: 1fee8b2e96102712f92b6f7ddc36048d37f52b27 SHA-256: ff560e6c4e8b95c66b46e93224289462c723bea528e9adadd156c5b639048895
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF document is identified as malicious by multiple heuristics, including a critical finding that it links to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF. The document's content, though appearing benign, is a lure to direct users to malicious URLs, likely for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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 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.
  • 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/award?keyword=complete+guide+to+conjugating+12020+french+verbs+pdf In PDF document text
    • http://fagawozuwa.22web.org/scripps_spelling_bee_2019.pdfIn PDF document text
    • https://roriwemako.weebly.com/uploads/1/3/4/5/134599113/xamasuganewatikatut.pdfIn PDF document text
    • http://samyog.ru/7918911967gkcyk.pdfIn PDF document text
    • http://pixxel.life/nystrom_desk_atlas_5th_editionldwb7.pdfIn PDF document text
    • http://liginirudusupob.22web.org/britney_spears_toxic_clarinet_sheet_music.pdfIn PDF document text
    • https://budasanufewe.weebly.com/uploads/1/3/5/3/135323580/9819825.pdfIn PDF document text
    • http://lordtrans.ru/best_trx_workouts_for_beginnersiihjh.pdfIn PDF document text
    • http://winoorama.site/20713424891zpx6d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcc1ee2a-a8d6-4b30-813b-ece2e0fbf835/how_to_learn_electrical_wiring.pdfIn PDF document text
    • https://s3.amazonaws.com/zakunafu/sesutepugedekegefo.pdfIn PDF document text
    • http://sadotewaxajus.epizy.com/85307899940.pdfIn PDF document text
    • https://s3.amazonaws.com/somisilegex/bissell_proheat_2x_revolution_carpet_cleaner_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f9dc73d-3236-4f00-b346-93d1c9da2eb4/25284156958.pdfIn PDF document text
    • http://sonopuzogex.rf.gd/stannah_stairlift_model_600.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4afd9502-3fe3-4958-be91-d29d7ed8279e/what_is_the_sum_of_exterior_angles_of_a_15_sided_polygon.pdfIn PDF document text
    • http://depegiwisa.epizy.com/letter_of_application_teaching_template_uk.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_off0000da51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA51 6076 bytes
SHA-256: 8e974c9baadf55a201451257190d7fbd0c1803f6c4f8eb5adccd4224384cb447
font_01_sfnt_off0000eee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE1 11212 bytes
SHA-256: 56f30e906d32ada4cc75349518837270b19022acb318c8737d77308550242c1a

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