Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c75c2fa3a22e6e4…

MALICIOUS

PDF

85.6 KB Created: 2021-03-14 13:03:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: cb3030f776171d284e2c82954577ad98 SHA-1: 27c2ab933cf1e71d4e43eaeb96eb74d1f5df6ce2 SHA-256: 9c75c2fa3a22e6e40afc6b17f474397483899b7bbbe2521108141af5008327f2
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are SEO-optimized and redirect to other PDF files, a common tactic for link farms or phishing campaigns. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic suggest the document is designed to drive traffic to malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://bologen.ru/wix?keyword=sonnet+about+high+school+life PDF link annotation
    • https://zusajozaza.weebly.com/uploads/1/3/1/3/131381142/xeviwarogur-javufafupo-newinugoroliled-razamow.pdfIn PDF document text
    • https://cdn.sqhk.co/vedimofaw/Lt2nsge/ice_cream_truck_near_me_tracker.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389792/normal_5fcbe3e51ffa5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495855/normal_6048c3a68643e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475715/normal_5fd822df47233.pdfIn PDF document text
    • https://cdn.sqhk.co/dinigivo/mggiguL/iron_maiden_legacy_of_the_beast_live_album.pdfIn PDF document text
    • https://vonenubu.weebly.com/uploads/1/3/5/9/135964133/dae510e.pdfIn PDF document text
    • https://cdn.sqhk.co/nebemina/q2ighgs/george_strait_song_lyrics_you_ll_be_there.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370529/normal_5feb9736288cf.pdfIn PDF document text
    • https://cdn.sqhk.co/gefimiwotux/hbfji9Y/off_road_rally_7_hack.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417413/normal_5fc576cc6a1c9.pdfIn PDF document text
    • https://fabuduviwanor.weebly.com/uploads/1/3/4/7/134739750/d7c341.pdfIn PDF document text
    • http://zupubovogigu.iblogger.org/54426850738.pdfIn PDF document text
    • https://pulosonimoge.weebly.com/uploads/1/3/0/7/130739093/gexumamowujobizaw.pdfIn PDF document text
    • https://renezotutumiw.weebly.com/uploads/1/3/5/3/135343322/249693.pdfIn PDF document text
    • https://mozufakumijisa.weebly.com/uploads/1/3/5/3/135333945/c30a0b3dcf.pdfIn PDF document text
    • https://zadobezaja.weebly.com/uploads/1/3/0/7/130775221/8b32a6b02.pdfIn PDF document text
    • https://buliduxefexefux.weebly.com/uploads/1/3/1/6/131636978/81ad3d22287a37b.pdfIn PDF document text
    • https://cdn.sqhk.co/votawusebak/gIjfhiC/25172899368.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/xefejevife/jemisuvuf.pdfIn PDF document text
    • https://s3.amazonaws.com/regufojalojaza/quran_arabic_to_english_translation.pdfIn PDF document text
    • https://s3.amazonaws.com/zufojadibi/binder_tab_label_template.pdfIn PDF document text
    • https://s3.amazonaws.com/pisik/calisthenic_workout_plan.pdfIn PDF document text
    • https://s3.amazonaws.com/mogipegi/93062806158.pdfIn PDF document text
    • http://nupowabel.rf.gd/cast_away_movie_free_in_tamil.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_off00011208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11208 5292 bytes
SHA-256: a8d4924503136252b41aa6737b1aea74652ec9c84dd6e6ce3550ebce32f5b5a6
font_01_sfnt_off0001240c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1240C 10764 bytes
SHA-256: 63759a14bdb30f181f5c619edad087b5d676f26b3f213c6f57882e561f81f45c