Malicious PDF — malware analysis report

Static analysis result for SHA-256 4952d9a012475f03…

MALICIOUS

PDF

89.2 KB Created: 2021-03-30 14:29:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: ab40cd50e990ff30d512a68ed31549b1 SHA-1: 3e236f530b8bd7cb5c5932dd11cb58edcff4360d SHA-256: 4952d9a012475f03e48c66eaa3ff4ee4d741ed099b3954c9de9baf2d0723399a
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URIs that redirect to various websites, likely for SEO manipulation or to host further malicious content. The presence of multiple external links on disposable hosting, coupled with the 'PDF_SEO_LINK_FARM' heuristic, strongly suggests a phishing or spamming operation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • 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://zajinet.ru/123?utm_term=mobile+communication+interview+questions+and+answers+pdf PDF link annotation
    • https://ramageputa.weebly.com/uploads/1/3/1/6/131637054/dumilavifutus_wobumovuzivupiz_duwenofobejuli_tavekepawu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501654/normal_5fe23a41c9d21.pdfIn PDF document text
    • http://avtovishki-msk.ru/vce_exam_simulator_2._6._1_crackai1ok.pdfIn PDF document text
    • https://tajaleder.weebly.com/uploads/1/3/5/3/135320318/6c564.pdfIn PDF document text
    • http://rankingcoach-apps.com/qwest_actiontec_pk5000_default_passwordrusfw.pdfIn PDF document text
    • http://activa-fb.com/70752203862riex4.pdfIn PDF document text
    • https://cdn.sqhk.co/vupapevixu/cij2hbU/tumonifibutisiw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410731/normal_60000d74a182b.pdfIn PDF document text
    • https://cdn.sqhk.co/limizolaxa/Iihijeu/city_train_driver_simulator_public_train_games_online.pdfIn PDF document text
    • https://cdn.sqhk.co/tatidukigag/gQjseyC/rewards_reading_program_reviews.pdfIn PDF document text
    • https://cdn.sqhk.co/zokuwagopole/uii4ijb/best_ncaa_3_point_shooters_all_time.pdfIn PDF document text
    • http://itravelgr.com/icao_doc_9774_manual_on_certification_of_aerodromesovyoe.pdfIn PDF document text
    • http://top-agent.ru/58156519176hkpn6.pdfIn PDF document text
    • https://cdn.sqhk.co/joxutedunik/fJjehdC/dropwizard-_swagger_maven_repo.pdfIn PDF document text
    • https://cdn.sqhk.co/tarozawowe/giepsig/ta_express_white_hills_az.pdfIn PDF document text
    • https://cdn.sqhk.co/lebapivi/v4kQIjh/63240822471.pdfIn PDF document text
    • https://gasodugolulo.weebly.com/uploads/1/3/4/3/134375537/8128081.pdfIn PDF document text
    • https://lusimijibujadex.weebly.com/uploads/1/3/4/6/134677052/bavosare.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/paxuvagal/what_can_you_conclude_about_marbury_v._madison_1803.pdfIn PDF document text
    • https://s3.amazonaws.com/fowonaxul/bruce_lee_2_tamil_movie_songs.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_off0001127a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1127A 5608 bytes
SHA-256: def40afc3af2a41b9898a1931f5de7ac380f8db3f08b718f6d867915ac73ed8a
font_01_sfnt_off0001257d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1257D 10780 bytes
SHA-256: 927f0ac8c47d6993d454b24a0f0b5ecb08b9eb720aba213cb352ccfe4d38234d
font_02_sfnt_off00014a1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A1D 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f