Malicious PDF — malware analysis report

Static analysis result for SHA-256 b456a95c780b1cfe…

MALICIOUS

PDF

69.9 KB Created: 2021-02-15 05:11:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: dc034b369ec4eeb575f2daad58a8e9f5 SHA-1: 8a231a21d4f8d088f8fb25fa7eb03ba164b66c14 SHA-256: b456a95c780b1cfe63025e1fae17e7bb580d51016f19b12133b887ce6a98bba0
244 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a large link farm. The ML classifier and ClamAV also identified it as malicious. The embedded URLs suggest a phishing or scamming attempt, likely using the document as a lure to direct users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://crophysi.ru/123?utm_term=gameboy+apk+ios In PDF document text
    • https://cdn-cms.f-static.net/uploads/4413004/normal_5fe6eb3bd04ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423428/normal_5fdbf378c5665.pdfIn PDF document text
    • https://cdn.sqhk.co/genizataxom/cgXiaje/cruise_fashion_customer_care.pdfIn PDF document text
    • https://cdn.sqhk.co/zadoweferoxe/fXyVzmW/makuso.pdfIn PDF document text
    • https://cdn.sqhk.co/sejejajoxej/icghhig/70s_80s_90s_music_free_download.pdfIn PDF document text
    • http://naturmilans.fun/sesajememawokebamojurewakepkn3.pdfIn PDF document text
    • http://agentsoft.space/slacker_book_2miqjv.pdfIn PDF document text
    • http://shoes-storie.club/boruto_manga_chapter_13px30z.pdfIn PDF document text
    • http://blog-uniswap.org/arduino_servo_datasheetjp8f6.pdfIn PDF document text
    • https://cdn.sqhk.co/depifozopupe/WZ0YmKW/tibobigexugububaripeberu.pdfIn PDF document text
    • https://cdn.sqhk.co/duwokarewesu/jjkzmGn/beach_soccer_world_cup_2017_winner.pdfIn PDF document text
    • http://digitalcalakk1.xyz/66841996554rbinl.pdfIn PDF document text
    • https://cdn.sqhk.co/zasemewiti/B2if5jj/32858956360.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465396/normal_5ffb425b45d94.pdfIn PDF document text
    • https://losulojer.weebly.com/uploads/1/3/0/7/130739206/5535418.pdfIn PDF document text
    • https://genezekanoz.weebly.com/uploads/1/3/1/4/131413678/894f56b9748154e.pdfIn PDF document text
    • https://cdn.sqhk.co/dezosanag/Srifge2/joresilojapobevura.pdfIn PDF document text
    • http://idealica-it.website/zidavaxedasaruxumuvamudag.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d40f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD40F 5172 bytes
SHA-256: f3426ce733d9eb4be0334508fc4d82d6803e8f7549c492d9d95d7f65a017603a
font_01_sfnt_off0000e5a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A5 10872 bytes
SHA-256: 1f0757b5f5aa45bf0c11e02cfad3cb195e207a9d9f33972e60f05e2308e0b1b9

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