Malicious PDF — malware analysis report

Static analysis result for SHA-256 0315e124d02f0b63…

MALICIOUS

PDF

73.3 KB Created: 2021-03-18 18:43:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: fa06561860610bf96939bc3fc8b04fe2 SHA-1: b14ca02fe1fc7e277e3ca31b406f6a928241fd03 SHA-256: 0315e124d02f0b6323f0f68cb911fd8b6796e5cdc106c3d1072eb2b61a82ac4b
254 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, with a critical heuristic firing indicating it links to known malicious redirector infrastructure. The presence of a large number of PDF links, some pointing to SEO-optimized URLs, suggests a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing further malware or conducting phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/123?utm_term=back+way+by+vybz+kartel In PDF document text
    • https://cdn-cms.f-static.net/uploads/4489588/normal_5fda1437b50ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490264/normal_60357e60591b1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369905/normal_5ffc543c31870.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451027/normal_604630484942f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445733/normal_6024372220c2d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387928/normal_5fe3bb6f83363.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462339/normal_603f061ae1dc0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403410/normal_600c918f64f77.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387718/normal_5ffd556254191.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/dowadotiju/kajaluzeru.pdfIn PDF document text
    • https://d89d6b52-6e76-4e18-bccb-bd7428cfddad.filesusr.com/ugd/02beb7_de1bf7740d2e4c96bb98038c9c1e379e.pdf?index=trueIn PDF document text
    • https://37cc4ef3-276f-49d0-84f3-8bc08bbde6a9.filesusr.com/ugd/e4a5d4_857d167db93c45debc47de6201260e00.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xovajukoxin/il_mulino_di_amleto.pdfIn PDF document text
    • https://s3.amazonaws.com/mipeboro/mariam_khan_reporting_cast_name.pdfIn PDF document text
    • https://s3.amazonaws.com/pozokimepe/organisational_culture_meaning_in_tamil.pdfIn PDF document text
    • https://9e77dbea-16d6-438e-9859-4a68c5388828.filesusr.com/ugd/3225da_f71f3f6d67034fafbdfff99ec878f2d3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bidemewufa/associated_press_style_guide_online.pdfIn PDF document text
    • https://s3.amazonaws.com/juzowilipi/lofisobinu.pdfIn PDF document text
    • https://d73c234d-0e3d-497d-8108-d5659bace061.filesusr.com/ugd/58a813_96f9591f110244b1b7ef3603ff1a5885.pdf?index=trueIn PDF document text
    • https://51f47fa2-20f7-4ec4-bb91-8ae4aee689b4.filesusr.com/ugd/917232_10227f685c434ef3a8e89ac3d516e6d6.pdf?index=trueIn PDF document text
    • https://2080fafa-2491-4ac3-8118-a138f33bff34.filesusr.com/ugd/822ecd_5cc72c61db5848d781602b395ee9458e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/siwixomudit/bijefip.pdfIn PDF document text
    • https://s3.amazonaws.com/banula/hp_officejet_7310_all-in-one_printer_manual.pdfIn PDF document text
    • https://d54d55f4-8004-4613-9f19-7b96cbed0ae7.filesusr.com/ugd/ce4b32_5205cea261e440298a178a63b8c85a2c.pdf?index=trueIn PDF document text
    • https://7b9449e5-51e9-4a7e-81f5-8587c42320f9.filesusr.com/ugd/571bad_d4e404d3cefe4f85a9cc5843f1161aad.pdf?index=trueIn 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_off0000df15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF15 5172 bytes
SHA-256: 62540cb39d09cb5c99d155d25abacb729f3875b2dd80639b81961c2ce8de1773
font_01_sfnt_off0000f0e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E7 10800 bytes
SHA-256: 8dd7df9b07d91ffd8b9ffa7505b1e8b0592b70e03256a8042fb2305a24aa3579