Malicious PDF — malware analysis report

Static analysis result for SHA-256 89a21a4121bc94a4…

MALICIOUS

PDF

75.0 KB Created: 2021-05-19 04:54:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: a285ef90e3ff080b47f77ea1246ab8c6 SHA-1: 6745a30e00c1637d5546a69bf5b8303b20cb95c0 SHA-256: 89a21a4121bc94a427e3d8129edbd0711e641bac0400989a73a7c2139976ce2d
254 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple heuristics indicating it is a malicious redirector and part of an SEO link farm, designed to lure users to potentially harmful websites. The primary malicious URL identified is https://crophysi.ru/strik?utm_term=games+like+nyt+spelling+bee. ClamAV also detected this file as Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0, reinforcing its malicious nature.

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
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://crophysi.ru/strik?utm_term=games+like+nyt+spelling+bee In PDF document text
    • http://tinonijo.iblogger.org/mewodasupope.pdfIn PDF document text
    • https://fesuxuxij.weebly.com/uploads/1/3/4/6/134693362/1960195.pdfIn PDF document text
    • https://wufezaju.weebly.com/uploads/1/3/0/7/130738917/gupojeduxigozu.pdfIn PDF document text
    • https://vaxetilunakado.weebly.com/uploads/1/3/4/0/134012354/753450.pdfIn PDF document text
    • https://kodepifaz.weebly.com/uploads/1/3/4/7/134705681/3ddb8fc3.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/7061446d-8d8e-4d05-b52c-d69228e344ab/how_do_you_troubleshoot_a_whirlpool_refrigerator.pdfIn PDF document text
    • https://s3.amazonaws.com/bidivo/73060980955.pdfIn PDF document text
    • http://rixijine.rf.gd/chiari_malformation_surgery_in_adults.pdfIn PDF document text
    • https://s3.amazonaws.com/muvazi/bot_auto_liker_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/supefujoxopubu/60562931460.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0f4d720-9a40-4b3c-8e35-712b8c6a6172/rozawikepubizibuvadesib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2138830-ba17-4d43-b947-aa3fbe61960f/weber_spirit_ii_e-320_price.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/app_lock_apk_old_version.pdfIn PDF document text
    • https://s3.amazonaws.com/juzewojavomofew/pegujavi.pdfIn PDF document text
    • http://xowevabi.epizy.com/42294290485.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/626e0233-1dd2-469a-9c1b-42577c259538/78459449443.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0ae0dfe-e236-4766-80e2-e744aa8eadc3/2011_chevy_traverse_power_steering_pump_recall.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_off0000e795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE795 5380 bytes
SHA-256: 353e0f471135a2f575b10e332248ae8604708cb6e827a19671e57e5c5c00ca2c
font_01_sfnt_off0000f9e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E3 11060 bytes
SHA-256: f9369cc08c28f997bd195e1d3bba517120fd8861cc4d02bb1ec137d43d7139cb

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