Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecce44158878d8a6…

MALICIOUS

PDF

82.1 KB Created: 2021-04-27 15:48:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 2c9bbe40119d52d57691a6b59b21195f SHA-1: 6508b79770a5e97afeb0a2407a2f98a03ee3f25c SHA-256: ecce44158878d8a6f648588ad870d8ddba4355dcec15bcf2972b8a8facb5c337
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://vilenefex.ru/strik?utm_term=why+was+the+divergent+series+cancelled PDF link annotation
    • https://cdn.sqhk.co/retepisej/6ieid9L/bootstrap_4_template_for_tutorial_website.pdfIn PDF document text
    • https://cdn.sqhk.co/pidodalatip/glNhfgh/24909971457.pdfIn PDF document text
    • https://cdn.sqhk.co/dasisogi/iMffsAK/turogatimitofoxukeguwa.pdfIn PDF document text
    • http://xasowokudat.medianewsonline.com/45079274045.pdfIn PDF document text
    • https://cdn.sqhk.co/fukonovum/z3hcaie/xodojetefaneded.pdfIn PDF document text
    • http://fiziwafofekaku.mygamesonline.org/basic_english_grammar_tense_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/zokosofu/hgia4gh/road_crash_secret_level.pdfIn PDF document text
    • http://crystal-light33.ru/36406268485veq77.pdfIn PDF document text
    • http://antonioita.fun/tefemuwugaxukujewanlw80e.pdfIn PDF document text
    • http://daating19.site/how_to_setup_the_tp_link_extender0qavd.pdfIn PDF document text
    • http://vopezikililurab.mygamesonline.org/dosage_de_la_creatinine.pdfIn PDF document text
    • http://dietnatur.fun/chapati_video_songa509p.pdfIn PDF document text
    • http://larekew.mywebcommunity.org/sikukama.pdfIn PDF document text
    • http://kixiwogazu.sportsontheweb.net/19774248047.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://abf133a7-37c0-4616-b653-d99fd306bce3.filesusr.com/ugd/5c8236_00bf47cf493746eca4dbe459aa20d00d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mamibis/travel_reports_m40.pdfIn PDF document text
    • https://s3.amazonaws.com/tobovunoberiki/how_to_turn_check_engine_light_off_honda_accord.pdfIn PDF document text
    • https://s3.amazonaws.com/muxozuvalubi/38244959078.pdfIn PDF document text
    • https://98e80eac-0673-4bf9-a3de-4132461903b3.filesusr.com/ugd/1acd69_794be37d557245aa84b092c78e27e453.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c30ce56f-c567-4b2f-88b1-b99fa96d2199/6625171963.pdfIn PDF document text
    • https://0a3c8164-ddd9-4522-8472-457ce31ece15.filesusr.com/ugd/d32f78_a0735e2e5bda4fcea2e2f579509ae264.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe09eb79-7fa7-4e79-911f-7a4ecb2618c7/konajowijewalirabamuxe.pdfIn PDF document text
    • https://203e7bc3-08d7-4ecc-a8df-f797e0d4a079.filesusr.com/ugd/d4579c_d93c0453c9544f2e94f1eecb046813f3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dabatisew/saxusulibaputoponukowa.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_off0000fef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF2 5468 bytes
SHA-256: 57fcaf838482a8119b4bd3e42b249318f3c4582072c9b1e2fb5271b72f1b1126
font_01_sfnt_off000111a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A7 11784 bytes
SHA-256: 03f4777c526dd229b9b469cbab45ec2a45b7b4d92626806abf1278fcdc2a6136