Malicious PDF — malware analysis report

Static analysis result for SHA-256 9897895bf9b5dc01…

MALICIOUS

PDF

72.7 KB Created: 2021-01-23 00:04:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 28d574c59ba5bcdf0340ca9e1206388f SHA-1: 7d6fa25c826661d137001abdb1dd5a341a7b7214 SHA-256: 9897895bf9b5dc01413114ecb69e135b4ba83e3f27f4926a05629a2e97d8d995
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external resources, which is indicative of a link farm. One critical heuristic identified a link to known malicious redirector infrastructure. The ClamAV detection and ML classifier further support its malicious nature, suggesting it's used for phishing or distributing further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://traffine.ru/aws?utm_term=python+2.+7.+6+32+bit In PDF document text
    • https://cdn.sqhk.co/rinovizifim/hOTXiaQ/drums_set_for_sale_near_me.pdfIn PDF document text
    • https://ludalobupum.weebly.com/uploads/1/3/4/5/134528654/tuwus.pdfIn PDF document text
    • https://fuxiwajusefu.weebly.com/uploads/1/3/4/6/134617271/164978.pdfIn PDF document text
    • https://wosutazewaxutu.weebly.com/uploads/1/3/0/7/130775331/xotefugemo-nujojevanax-xapan.pdfIn PDF document text
    • https://vexibalob.weebly.com/uploads/1/3/4/8/134896466/kapovuwekupeno.pdfIn PDF document text
    • https://jalaxogazumin.weebly.com/uploads/1/3/4/3/134373329/f84a53014.pdfIn PDF document text
    • https://letotanuvimipe.weebly.com/uploads/1/3/4/5/134598603/debabinusu-veguxekiw-tevabarirot.pdfIn PDF document text
    • https://cdn.sqhk.co/komajekolino/cgfPicX/lexameloba.pdfIn PDF document text
    • https://rixowumunek.weebly.com/uploads/1/3/5/3/135330445/pomaj-rikojego-galofexanel.pdfIn PDF document text
    • https://wesuzimowigimeb.weebly.com/uploads/1/3/4/7/134745326/51fb2a9124.pdfIn PDF document text
    • https://madugonado.weebly.com/uploads/1/3/2/8/132815119/9729540.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/feborobegibew/lotikajamu.pdfIn PDF document text
    • https://s3.amazonaws.com/ragejufa/54466071572.pdfIn PDF document text
    • https://s3.amazonaws.com/joterige/netflix_film_en_op_usb_stick.pdfIn PDF document text
    • https://s3.amazonaws.com/jidosatikim/31621869886.pdfIn PDF document text
    • https://s3.amazonaws.com/dazutun/primary_source_verification_report_naric.pdfIn PDF document text
    • https://s3.amazonaws.com/vonutavekip/nys_heap_income_guidelines_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/sazomo/cross_bridge_formation_between_actin_and_myosin.pdfIn PDF document text
    • https://s3.amazonaws.com/wizitifowubux/merasurej.pdfIn PDF document text
    • https://s3.amazonaws.com/tinivukedeta/video_er_for_pc_windows_8.pdfIn PDF document text
    • https://s3.amazonaws.com/nonabafat/wifuxibalut.pdfIn PDF document text
    • https://s3.amazonaws.com/lezerawe/gyriform_diffusion_restriction.pdfIn PDF document text
    • https://s3.amazonaws.com/kosipefojaw/essential_idioms_in_english_book.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_off0000e18f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18F 5064 bytes
SHA-256: 227c0e36fc038ab7be7e3429016a8e38a39c3fb9786eff35d1fa52ea99ea0bbd
font_01_sfnt_off0000f2e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E9 10164 bytes
SHA-256: ad21a2a52abe043cc60a121e35f1c06b3b42ea6713464863f38fa1472d48a069

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