Malicious PDF — malware analysis report

Static analysis result for SHA-256 447735baf5e9c3ff…

MALICIOUS

PDF

73.1 KB Created: 2021-05-16 20:04:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: ef5935e68cb4225a1abeae8d66dc07cc SHA-1: e9d0f3946cfe7ebd51ab0f707add551e30f869bb SHA-256: 447735baf5e9c3ff6ef0adf7f9d4962e84f78f550b1017042b42efc5462eec8d
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. One prominent URL, https://xajibur.ru/strik?utm_term=how+to+change+belt+on+hoover+windtunnel+self-propelled, is presented as a search result for a common query, likely to deceive users into clicking. No scripts were extracted, but the PDF structure and link farm heuristics indicate a malicious intent to redirect users to potentially harmful content.

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://xajibur.ru/strik?utm_term=how+to+change+belt+on+hoover+windtunnel+self-propelled PDF link annotation
    • https://rigukolanerimi.weebly.com/uploads/1/3/4/5/134519373/8511897.pdfIn PDF document text
    • https://pinenovi.weebly.com/uploads/1/3/4/5/134509314/wopevuwisurijo-zekasimazabi.pdfIn PDF document text
    • https://nadaxujapowa.weebly.com/uploads/1/3/4/8/134891343/cc6cb7bd1204.pdfIn PDF document text
    • http://raffle.website/97140320751ykipy.pdfIn PDF document text
    • https://xanalefude.weebly.com/uploads/1/3/1/4/131411596/d36c5f.pdfIn PDF document text
    • http://posurazatux.mypressonline.com/canara_bank_account_opening_application_form.pdfIn PDF document text
    • https://ladevizeloraben.weebly.com/uploads/1/3/1/6/131606454/9b5b82e26d4.pdfIn PDF document text
    • http://gromstroy.com/what_color_is_the_tags_for_2020_in_michiganwn5pw.pdfIn PDF document text
    • http://frankiearvelo.com/pollo_loco_chicken_bowl_caloriesqjqvo.pdfIn PDF document text
    • https://futisukafasuku.weebly.com/uploads/1/3/5/3/135345320/c5d0a0488b0628.pdfIn PDF document text
    • https://winakafefumo.weebly.com/uploads/1/3/1/3/131397983/ee32b6.pdfIn PDF document text
    • https://nojenekaxaxi.weebly.com/uploads/1/3/4/0/134017841/e46e6dd04.pdfIn PDF document text
    • https://lomofoxagut.weebly.com/uploads/1/3/4/5/134524577/zadusi.pdfIn PDF document text
    • https://pexasojurez.weebly.com/uploads/1/3/1/3/131381046/a8c30d5.pdfIn PDF document text
    • http://all-system7.work/kabeluwulalokokitwvjq.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/tokudapele/66151018059.pdfIn PDF document text
    • https://s3.amazonaws.com/rurovikejigibu/janitorial_contracts_templates_free.pdfIn PDF document text
    • http://nezugetojuf.myartsonline.com/banting_diet_food_list_download.pdfIn PDF document text
    • http://jasunusemoki.onlinewebshop.net/zapixapodenopezizasiwona.pdfIn PDF document text
    • http://dasobiviwadodaj.atwebpages.com/navy_protocol_manual.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_off0000dbcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCB 5704 bytes
SHA-256: 610479531f60cdf570e2314d0c9083a77b4b37e25c7ae2cdbc298d02d46fe02d
font_01_sfnt_off0000ef44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF44 11684 bytes
SHA-256: 881b4570be45b5ca19595315f34b757759cd84c76f6bba559f07316d9dc1eec4

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