Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1a1c534102b4595…

MALICIOUS

PDF

77.0 KB Created: 2021-03-14 14:09:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: e2cdb25d56ce121e5b971fd42c4bef37 SHA-1: ec907cc0eabce8113c989324749e7a671026daff SHA-256: d1a1c534102b4595a4924da9005b0d1d76d9d0aa58b0417eb09b68a2ed80db2a
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, which is characteristic of SEO link farms or phishing distribution. ClamAV and ML classifiers also flagged this file as malicious, specifically as a phishing trojan. The embedded links suggest an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/award?keyword=acres+of+diamonds+story+pdf PDF link annotation
    • https://cdn.sqhk.co/divojimo/jcVVhbv/business_tips_for_new_entrepreneurs.pdfIn PDF document text
    • http://lnstagram-helping-centre.com/glass_sword_read_onlinenuo49.pdfIn PDF document text
    • https://posajegodat.weebly.com/uploads/1/3/4/4/134477503/meporuzojoxe.pdfIn PDF document text
    • https://cdn.sqhk.co/moserusoba/ctdAjbs/fiwofopalupob.pdfIn PDF document text
    • http://delinapod.mypressonline.com/89027060126.pdfIn PDF document text
    • https://bovimifukid.weebly.com/uploads/1/3/4/8/134882826/xinaxogog.pdfIn PDF document text
    • https://laverikiwife.weebly.com/uploads/1/3/4/5/134502667/7913522.pdfIn PDF document text
    • http://arnautmebel.ru/nelson_textbook_grade_6_answers9g2tv.pdfIn PDF document text
    • https://cdn.sqhk.co/puxolika/h2arhcr/call_of_mini_zombies_free_iap.pdfIn PDF document text
    • https://nobixerevogug.weebly.com/uploads/1/3/4/4/134481004/ee8be3477713e61.pdfIn PDF document text
    • http://easycreditscore.info/51677578987finku.pdfIn PDF document text
    • https://mixudepira.weebly.com/uploads/1/3/4/3/134379104/27c325c03.pdfIn PDF document text
    • https://sapigufebo.weebly.com/uploads/1/3/4/5/134592603/49122.pdfIn PDF document text
    • http://lorakuze.sportsontheweb.net/80960249490.pdfIn PDF document text
    • http://mogimetekojubar.scienceontheweb.net/zemarobu.pdfIn PDF document text
    • http://xemizawufogutuf.scienceontheweb.net/48796163039.pdfIn PDF document text
    • https://cdn.sqhk.co/naruxibe/4zChbVG/dabiboxaf.pdfIn PDF document text
    • https://giduwuxudi.weebly.com/uploads/1/3/4/7/134716719/374ea0bc.pdfIn PDF document text
    • https://cdn.sqhk.co/bukoxomule/i7OgKic/lepuletotekibiwoda.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sametil.epizy.com/method_wheels_fitment_guide.pdfIn PDF document text
    • http://nugafafekovad.epizy.com/mekoguxomowewukefuduvu.pdfIn PDF document text
    • http://povajifen.rf.gd/diniv.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_off0000f092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF092 5360 bytes
SHA-256: 5cd88dd002a5c8cae1cce1849b579a055ead183ed1607b92f15edc20d0160890
font_01_sfnt_off000102c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C0 10164 bytes
SHA-256: b1f01d6a1938d349e5a7198b010be0e2c16931240187b3cecb6ae89653b3599d