Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d82c04bae95bdfb…

MALICIOUS

PDF

81.2 KB Created: 2021-03-15 17:21:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5f72755f7ab12d5ab8fbfd4774803e50 SHA-1: 538a946c67f52ed30169879c6d87a2c849a311d8 SHA-256: 0d82c04bae95bdfb4f5eb7f4d6cced378023c5e4f25a366649cd829fbc0b7f6d
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used in link farm or phishing attacks. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically a phishing trojan. While no scripts were explicitly extracted, the presence of many external URLs suggests the document is designed to redirect users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://vilenefex.ru/123?utm_term=alice+in+wonderland+story+book
    • https://cdn-cms.f-static.net/uploads/4456982/normal_5fd1a9f5a66d6.pdf
    • https://static.s123-cdn-static.com/uploads/4486552/normal_5feb949b520f5.pdf
    • https://cdn.sqhk.co/tekuligote/gghjhgc/tabletop_christmas_tree_amazon.pdf
    • https://bodokevusigow.weebly.com/uploads/1/3/2/7/132740435/1470624.pdf
    • https://cdn-cms.f-static.net/uploads/4493553/normal_5fe6ad70d965f.pdf
    • https://cdn.sqhk.co/laruxibut/jg4pEk4/oddmar_ios_ipa.pdf
    • https://cdn-cms.f-static.net/uploads/4379030/normal_60293470f2a36.pdf
    • https://cdn-cms.f-static.net/uploads/4500001/normal_602995e89bd5a.pdf
    • https://xapitutas.weebly.com/uploads/1/3/0/8/130813648/1939042.pdf
    • https://static.s123-cdn-static.com/uploads/4390642/normal_5fc7cc7ad2aa6.pdf
    • https://cdn-cms.f-static.net/uploads/4375699/normal_604c9c7116dce.pdf
    • https://cdn.sqhk.co/kolusugego/JzFjbgt/game_companion_watch_dogs_2_laptop.pdf
    • https://cdn-cms.f-static.net/uploads/4448743/normal_602a11a00351c.pdf
    • https://vawegoti.weebly.com/uploads/1/3/0/8/130874218/ee30f6282f073f0.pdf
    • https://static.s123-cdn-static.com/uploads/4412570/normal_5fef503bacafd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/271a75d6-19c2-4251-ba97-0a2afa6f0d71/86974596981.pdf
    • https://uploads.strikinglycdn.com/files/8fbd8110-e4c3-4de6-9760-9afc22ebfd36/what_happens_to_the_twins_in_lord_of_the_flies_chapter_11.pdf
    • https://uploads.strikinglycdn.com/files/5c5752a5-17b0-4642-a099-0a514993a52b/what_does_ninety-five_theses_mean_in_world_history.pdf
    • https://uploads.strikinglycdn.com/files/011cd1fe-26a6-4dab-aab0-cedaecb19d91/biblia_hebreo_espanol_gratis.pdf
    • https://uploads.strikinglycdn.com/files/9075a0ad-f93b-41b4-83a4-66aa0d9da100/creative_description_of_a_sunrise.pdf
    • https://uploads.strikinglycdn.com/files/364e0491-39ac-4657-b216-3d1a511063ab/what_battery_does_my_key_fob_need.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_off0000f47a.bin
d2725c8f4307979a3e328b85de606e45326cd4484e5a7621dfb1ee36e6adb0aa
pdf-font-stream PDF embedded font (sfnt) at offset 0xF47A 5108 bytes
font_01_sfnt_off000105ea.bin
319ea4af3ad012da81d5df2d3c89bf40c315d148e42ed49849c36e0f1d6c30de
pdf-font-stream PDF embedded font (sfnt) at offset 0x105EA 10400 bytes
font_02_sfnt_off0001298a.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1298A 4324 bytes