Malicious PDF — malware analysis report

Static analysis result for SHA-256 31cce84ed96d5e60…

MALICIOUS

PDF

77.9 KB Created: 2021-04-03 14:21:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d504d5c6eeb09cbe960bc291a23097d2 SHA-1: af6fd27017c6998d410c19ccebc52a902a858329 SHA-256: 31cce84ed96d5e60b9434da89e6d64ee13cebc2e8c85d27bf9a676fd5722fdcd
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to potentially malicious or spam-related domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The document body, though heavily obfuscated, suggests a lure related to 'English language test book pdf'. The presence of external URIs and the ML classifier's high confidence score point towards a phishing or SEO spam attack pattern. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dugedepap.ru/award?keyword=english+language+test+book+pdf
    • https://saxetesaw.weebly.com/uploads/1/3/5/3/135301220/sewirotuj.pdf
    • http://dotixomovi.sportsontheweb.net/cd4051_datasheet.pdf
    • http://ppl-nutrshopfit.website/e-_verify_form_usaoaoxw.pdf
    • http://microbladingeyebrowsdallastx.com/serusefildpl0t.pdf
    • https://lexojonogi.weebly.com/uploads/1/3/4/3/134315697/4950118.pdf
    • http://prizinsta365.website/literal_equations_worksheet_8th_gradekp7ck.pdf
    • http://webcam-model.online/my_family_story_badgep00ao.pdf
    • https://jibigevemur.weebly.com/uploads/1/3/0/8/130873945/majiluxevarabit_wipebawakakerud_tajapawo_jotonukite.pdf
    • http://trikotoria.ru/2_step_math_word_problems_3rd_grade_worksheets3mnny.pdf
    • http://jarevine.mywebcommunity.org/24850518364.pdf
    • http://levitajagukog.scienceontheweb.net/rinowufumevutelajusab.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/79139e23-c3b5-49c5-b517-f3377ae042e9/three_important_facts_about_langston_hughes.pdf
    • https://86860ce8-2957-478e-97c3-2abddc2d2c3c.filesusr.com/ugd/754ed1_5cd2f5b5647b4c0c8f068b9bf53855cf.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f33f4dbb-dbe4-4c2b-9249-f8ad7ddd4f7b/how_to_write_a_bad_restaurant_review_for_school.pdf
    • https://f0ddeb88-3549-4a27-8821-6e3dd713f165.filesusr.com/ugd/2b74da_2db43d0d31d34666ae7d5faacdf9f48d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/5ee1dc4b-031f-4f1e-9e1c-67673b905ed4/tecumseh_ohh60_torque_specs.pdf
    • https://6b9ff03a-ef48-417a-a14c-919df0f903d0.filesusr.com/ugd/f459ea_ebd117179c98499e92068cfac015e202.pdf?index=true
    • https://uploads.strikinglycdn.com/files/caf6ba8e-3231-4c66-9255-fc6c14132665/what_is_the_social_constructionist_mission.pdf
    • https://uploads.strikinglycdn.com/files/5790f670-c1cd-4f02-8845-8d8d309d2238/why_does_my_portable_air_conditioner_leak_water.pdf
    • http://wavexijazibivat.myartsonline.com/dukugikenilirital.pdf
    • https://bf2b7b75-7790-49a7-81e6-d2546e692b42.filesusr.com/ugd/8ccf63_29910613bf7a4da5b316b6c2215d75b1.pdf?index=true
    • https://3d6da986-5be3-4955-9d5c-e891e6c56a45.filesusr.com/ugd/3c671a_b8d304be356c47e399cea9746bfaa6ba.pdf?index=true
    • https://uploads.strikinglycdn.com/files/648d9fe3-9986-4086-b53f-a85072c7555f/text_features_4th_grade_powerpoint.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efa7.bin
6e1afab46f1b0a2c02df75a0e9cbe38bf4bfadc5f218dc9e7b9e3f51df4ffa03		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA7 5368 bytes
font_01_sfnt_off000101ed.bin
09c19be0e3bccaf910fbe610a8a1f1cf3a4eaef07c3119fb01d79e599130592f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101ED 11944 bytes

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