Malicious PDF — malware analysis report

Static analysis result for SHA-256 7419a0da4923dc26…

MALICIOUS

PDF

134.8 KB Created: 2021-03-19 19:16:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cdd88b05c43b093aa24f6d0a3191f375 SHA-1: 50cb3b5d395e86bce1864c14005344237bdae534 SHA-256: 7419a0da4923dc264f933ce99d86bd602f8d9ec3777b42b0c76025cbcd9dd681
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO spam or phishing campaigns. The heuristic PDF_SEO_LINK_FARM specifically indicates a large number of external PDF links, and the ClamAV detection as Pdf.Phishing.Trojan further supports malicious intent. The document body, though heavily obfuscated, contains a title related to human origins, likely a lure to attract clicks to the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lozipotod.ru/award?keyword=origen+del+hombre+americano+teorias+pdf
    • https://static.s123-cdn-static.com/uploads/4416927/normal_5fed5d04c7877.pdf
    • http://jadebey-x.com/sharp_microwave_oven_with_grill_and_convection_manualcsjyo.pdf
    • https://dexekuweda.weebly.com/uploads/1/3/4/7/134705305/fimagalavunefo.pdf
    • http://nutristrike-shop.ru/physics_formulas_for_kinematics_in_one_dimensionvs0y4.pdf
    • https://static.s123-cdn-static.com/uploads/4388156/normal_60072496b02cc.pdf
    • http://stopnutristrike.ru/jatuzanejkqt1b.pdf
    • https://sekinejifupom.weebly.com/uploads/1/3/5/3/135350217/gumoruginakebido.pdf
    • https://cdn-cms.f-static.net/uploads/4453734/normal_5fda47503022a.pdf
    • https://static.s123-cdn-static.com/uploads/4490140/normal_5ffae81871e20.pdf
    • https://sezalufuveded.weebly.com/uploads/1/3/4/3/134389043/350d54a2.pdf
    • https://static.s123-cdn-static.com/uploads/4479932/normal_6000768ce84e6.pdf
    • https://tatogupuragafa.weebly.com/uploads/1/3/4/0/134096405/jasuv.pdf
    • https://mujolimu.weebly.com/uploads/1/3/4/8/134868529/0fa4c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vinejivunitego/james_tamil_guide_10th.pdf
    • https://s3.amazonaws.com/fakuguvil/54510495706.pdf
    • https://s3.amazonaws.com/paropabaru/logo_backdrop_template.pdf
    • https://s3.amazonaws.com/gebukil/best_bhaigiri_whatsapp_status.pdf
    • https://s3.amazonaws.com/fonazuzixagizir/78417456731.pdf
    • https://uploads.strikinglycdn.com/files/c4f30a49-d4eb-4b7f-b768-4f1ee883d51b/cloud_computing_jobs_entry_level.pdf
    • http://vajipiposugeto.rf.gd/journey_to_the_west_tamilrockers_download.pdf
    • https://uploads.strikinglycdn.com/files/e495db09-06ec-4980-a9c7-8d904dd8681c/81030693589.pdf
    • http://farixafodamipis.rf.gd/60669162273.pdf
    • https://uploads.strikinglycdn.com/files/17019d78-f76b-40b1-a0db-cc2872ac9231/zexexirufujoku.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001bbe6.bin
8325751ed57459f848562171f077b499566e950ce5a24dad2ada65d1672ecb9c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1BBE6 4580 bytes
font_01_sfnt_off0001cc16.bin
e7a723e49c78819845c27d57504cb7143a2dd1ef458b508fc82d518778195421
pdf-font-stream PDF embedded font (sfnt) at offset 0x1CC16 5736 bytes
font_02_sfnt_off0001df66.bin
36763544d277535a1104347e9a9a851377d41914f97e4ad10af05f5ee2231647
pdf-font-stream PDF embedded font (sfnt) at offset 0x1DF66 14504 bytes