Malicious PDF — malware analysis report

Static analysis result for SHA-256 f480133cd41bee65…

MALICIOUS

PDF

76.6 KB Created: 2021-02-26 15:35:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: d88c62383a96703fe87331e11dd7d3ca SHA-1: da95722242ef82a4d90d1375affd8283ea77c236 SHA-256: f480133cd41bee6550bfc99a74b650d58d90525a93672e54a2192dc4d1748376
244 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier, indicating a high likelihood of malicious intent. The presence of numerous embedded links, including one pointing to known malicious redirector infrastructure, suggests a phishing or link-farming campaign. The document body, though heavily obfuscated, contains metadata related to PDF generation, further supporting its role as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://dafemum.ru/award?keyword=washington+post+sunday+crossword+solution In PDF document text
    • https://cdn.sqhk.co/xaselavub/htjbjh6/best_buy_brooklyn_ny_11239.pdfIn PDF document text
    • https://xopisamu.weebly.com/uploads/1/3/0/7/130776659/5819332.pdfIn PDF document text
    • https://cdn.sqhk.co/rapovixovuti/igo70ig/47415114062.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487194/normal_6033bcd61263e.pdfIn PDF document text
    • https://cdn.sqhk.co/dosakupu/hdDoihj/pipizanaberimukasusatos.pdfIn PDF document text
    • https://cdn.sqhk.co/lasanamemego/hgzibru/best_adventure_motorcycle_tyres_2020.pdfIn PDF document text
    • https://tuzenuzibawura.weebly.com/uploads/1/3/4/7/134733138/92c6dbb9b8f.pdfIn PDF document text
    • https://cdn.sqhk.co/tisufupujeli/JCIgchj/52470249317.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390995/normal_60347b4000729.pdfIn PDF document text
    • https://cdn.sqhk.co/zotipimesaza/b6iQqgd/amana_stackable_washer_and_dryer_lowes.pdfIn PDF document text
    • https://cdn.sqhk.co/tememukafosu/ZjgO5oi/joziduxurel.pdfIn PDF document text
    • https://vobinuxidixuf.weebly.com/uploads/1/3/4/4/134471365/36f3a937.pdfIn PDF document text
    • https://zoparidozuxeb.weebly.com/uploads/1/3/5/3/135390671/1912614.pdfIn PDF document text
    • https://cdn.sqhk.co/xivovido/jfqQib2/bulinus.pdfIn PDF document text
    • https://cdn.sqhk.co/mitukutowum/jidfUFN/brimstone_atv_park_rules.pdfIn PDF document text
    • https://cdn.sqhk.co/rakujolo/hjg4jc6/princess_design_talking_girl.pdfIn PDF document text
    • https://cdn.sqhk.co/molavagew/gcEjbje/17041134975.pdfIn PDF document text
    • https://basupetuwesaf.weebly.com/uploads/1/3/0/7/130739706/vadukizopezo.pdfIn PDF document text
    • https://cdn.sqhk.co/fetebutujo/hbhfTji/download_game_throne_rush_for_pc_offline.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401519/normal_5fd93b4ed56cd.pdfIn PDF document text
    • https://cdn.sqhk.co/gotofebelu/hif7wg3/catfishing_definition_urban_dictionary.pdfIn PDF document text
    • https://pabovojusu.weebly.com/uploads/1/3/4/3/134339388/wenepevax_tumerixesi_lefedanob.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408596/normal_5feccd6aca3c0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D4 5304 bytes
SHA-256: dc7ac7c16f1a913481fc3a7bcf20753634cc61bcce7205940bfc8e246a2c9469
font_01_sfnt_off0000f4e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E3 9756 bytes
SHA-256: 3ed2ead84cfd66d1088bf8b38b9f9ed08b2fd6ce2a39e0709f4d175d0d01ce2e
font_02_sfnt_off0001163e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163E 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c