Malicious PDF — malware analysis report

Static analysis result for SHA-256 5981a5b46e55ffd1…

MALICIOUS

PDF

75.3 KB Created: 2021-01-17 21:30:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 2d3f8bc77c3a20e7ab03b3066176b923 SHA-1: d708afc9b6066d8d7d3837316781ca343254cebe SHA-256: 5981a5b46e55ffd111711ad8e81e5601def88fb7f5640aa683f6e5e26961264b
186 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, identified as a link farm, with one URL disguised as a "Neverwinter warlock leveling guide". The ClamAV detection and ML classifier strongly indicate malicious intent, likely for SEO manipulation or to redirect users to phishing or malware distribution sites. No scripts were extracted, but the PDF structure itself is used to host numerous external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://traffset.ru/123?utm_term=neverwinter+warlock+leveling+guide PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4379049/normal_5ffadd3797cf2.pdfIn PDF document text
    • https://site-1171628.mozfiles.com/files/1171628/66336816273.pdfIn PDF document text
    • https://cdn.sqhk.co/xinulezebi/jahhjbx/12391894243.pdfIn PDF document text
    • https://debasomi.weebly.com/uploads/1/3/0/7/130739769/816a77e35.pdfIn PDF document text
    • https://site-1175676.mozfiles.com/files/1175676/95136455607.pdfIn PDF document text
    • https://cdn.sqhk.co/jetirivotu/rjdKOej/word_games_for_online_teaching.pdfIn PDF document text
    • https://cdn.sqhk.co/luxixumogez/hgieicZ/suvewujajaforanexixejus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457862/normal_5fa4f2cbccac0.pdfIn PDF document text
    • https://pirowefe.weebly.com/uploads/1/3/4/4/134444143/a558b.pdfIn PDF document text
    • https://lemuladi.weebly.com/uploads/1/3/4/3/134316580/kevuriwenodajeraka.pdfIn PDF document text
    • https://cdn.sqhk.co/kovixileta/jaWdDgh/cnc_3018_limit_switch_wiring.pdfIn PDF document text
    • https://cdn.sqhk.co/zupodejadofe/fSrhihe/kick_kung_fu_video_download.pdfIn PDF document text
    • https://cdn.sqhk.co/jawutuwek/heggVS3/street_fighter_4_download_full_version_free.pdfIn PDF document text
    • https://cdn.sqhk.co/wijugilom/heifghb/66672537334.pdfIn PDF document text
    • https://cdn.sqhk.co/wirowanorax/jjjfJwj/khan_academy_mcat_prep_retiring.pdfIn PDF document text
    • https://cdn.sqhk.co/pujapipiwat/hadxjcq/slice_of_life_romance_anime_dub.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
    • https://s3.amazonaws.com/rurosaveruk/java_string_format_replace_0.pdfIn PDF document text
    • https://s3.amazonaws.com/tokafanawa/adobe_photoshop_touch_apk_new.pdfIn PDF document text
    • https://s3.amazonaws.com/vebisop/kobawuluroka.pdfIn PDF document text
    • https://s3.amazonaws.com/tokatefozude/bella_sara_codes_for_foals.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4E 4996 bytes
SHA-256: 8d64a8952ca4b589f1b89892315f3b63d31d46dd8305c743d9ee2ff63498d22e
font_01_sfnt_off0000ee6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6D 10264 bytes
SHA-256: de8e49de1c7ee29426340782016642e3ef4885284116119dfec27273dddb94e6
font_02_sfnt_off000111a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A9 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3