Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae85a1ec0e159385…

MALICIOUS

PDF

135.3 KB Created: 2021-03-31 15:57:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: e4a8fcf63879dc7ab91218952d25435e SHA-1: e4bc33aee492994c71fa2692732199a07102b0aa SHA-256: ae85a1ec0e159385d81332c4d823083311a8c1439fc4bab937a57e56006780ba
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://jottigo.ru/123?utm_term=lagu+album+bts+wings PDF link annotation
    • https://funifagokose.weebly.com/uploads/1/3/2/6/132681236/ae494160e7eeb8c.pdfIn PDF document text
    • https://jopokiwajisi.weebly.com/uploads/1/3/4/1/134108554/ff51e2e86b97.pdfIn PDF document text
    • https://cdn.sqhk.co/musutalivun/chbieTz/gazanabenabanakazodiposu.pdfIn PDF document text
    • https://xofujudafovebe.weebly.com/uploads/1/3/1/4/131410434/48783.pdfIn PDF document text
    • https://cdn.sqhk.co/nefikelifu/hjgjegg/police_auctions_rolex_watches.pdfIn PDF document text
    • https://gijepeparo.weebly.com/uploads/1/3/4/3/134318767/jusulotuzino-pawof-namevetis-bigevurapusubob.pdfIn PDF document text
    • http://feldhaus-klinker-plitka.ru/research_proposal_sample_for_masters_in_psychology3yfw2.pdfIn PDF document text
    • https://zonanasuwovu.weebly.com/uploads/1/3/2/6/132683154/96b59.pdfIn PDF document text
    • https://cdn.sqhk.co/puburikob/jjaggmQ/stripe_payment_gateway_integration_in_wordpress_without_plugin.pdfIn PDF document text
    • https://tupokigefadewun.weebly.com/uploads/1/3/4/7/134702618/3126554.pdfIn PDF document text
    • https://monisobagarov.weebly.com/uploads/1/3/1/8/131856119/kupakufo_vomopukobi_zakexilex_kesuso.pdfIn PDF document text
    • https://kokujefep.weebly.com/uploads/1/3/1/4/131409677/93d1e.pdfIn PDF document text
    • https://cdn.sqhk.co/dutudovajud/aXjdiaz/snake_found_in_toilet_texas.pdfIn PDF document text
    • https://cdn.sqhk.co/lijedubejop/ijdidji/zamowinudojupawidovu.pdfIn PDF document text
    • https://misevitazivizux.weebly.com/uploads/1/3/4/3/134376704/xifemu.pdfIn PDF document text
    • http://xtrading.buzz/54481597862f60y2.pdfIn PDF document text
    • https://tebifuwufarul.weebly.com/uploads/1/3/4/8/134886387/1dd4f52dc3c.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/pozokimepe/toxeb.pdfIn PDF document text
    • https://c7f0abc7-d23b-482d-bd16-0771495bb668.filesusr.com/ugd/bb13a2_1e5d2f23a1d948919c5cc16029bdd18a.pdf?index=trueIn PDF document text
    • https://770cee9b-59ea-4c2b-ae8d-aad83b0abb79.filesusr.com/ugd/8b25c7_cdf1404528004d139dbe91cdba476d40.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zoxewudunigus/nezovikupidipo.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_off000179d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179D7 30012 bytes
SHA-256: 625702fd7b9ec295eaaf7b1f08e1c62873b86fa0b36f72ec42756e5366314a94
font_01_sfnt_off0001d60a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D60A 5080 bytes
SHA-256: 7a47a01a4eb2f1635a46025aa117cda3bc2b5097bde22b1ebdf44f823136821f
font_02_sfnt_off0001e759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E759 12060 bytes
SHA-256: 2d603e00d3a7a33ca159155aca8df01f3056a407b54b1927b32b3407ea5cef04