Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3e25528a9d2c7ed…

MALICIOUS

PDF

81.8 KB Created: 2021-03-31 23:33:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fe39bb8e71c8c872b5fd84ed1b91db6e SHA-1: 7b33bfba4a986a8ac3c94cbcadf106446ca6ba5b SHA-256: e3e25528a9d2c7ed7769320beac01ae7a88cf34e66d074aa214df441c6352e57
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external links, including a link farm to other PDFs, suggests an attempt to distribute malicious content or engage in SEO-based phishing. The document body, though heavily obfuscated, contains keywords related to a search query, reinforcing the lure aspect.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://bologen.ru/award?keyword=book+of+enoch+dead+sea+scrolls+pdf
    • https://static.s123-cdn-static.com/uploads/4478393/normal_60010c202565e.pdf
    • https://cdn-cms.f-static.net/uploads/4368219/normal_602730c47d138.pdf
    • https://static.s123-cdn-static.com/uploads/4460975/normal_5fc7fcb919c73.pdf
    • https://static.s123-cdn-static.com/uploads/4379234/normal_5ffaa3b22c9e6.pdf
    • https://cdn-cms.f-static.net/uploads/4427526/normal_6014d7ee08f37.pdf
    • http://xivowotulupom.iblogger.org/beziposexuwo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/gomaxod/neramobanututekuge.pdf
    • https://d0fd53c2-66a5-49f7-a942-a4bfc50892a3.filesusr.com/ugd/11baf9_0917deac6b5c45fab8ec6376a4d80fe4.pdf?index=true
    • https://8bbfbdb8-1895-4472-a1c6-9e834ce25a60.filesusr.com/ugd/7deb27_5586f4969621472da786c5185e7e52c4.pdf?index=true
    • http://jusarim.epizy.com/switch_case_c_example_program.pdf
    • http://kenamumiv.rf.gd/farberware_pressure_cooker_guide.pdf
    • http://vuxonisozezuxov.rf.gd/51464323121.pdf
    • https://s3.amazonaws.com/fotepopunaj/guided_meditation_for_pain_free_sleep.pdf
    • http://joxumokuri.epizy.com/amd_graphics_card_for_laptop.pdf
    • https://s3.amazonaws.com/panalipolifod/29998905870.pdf
    • https://f9c380c0-3c9a-404e-8c76-a924832b335c.filesusr.com/ugd/9c8fb9_1e54f68ecba24101b184f74aca147ffa.pdf?index=true
    • https://s3.amazonaws.com/xajowu/go_math_grade_5_answers_key.pdf
    • https://11ab4cf5-156d-4417-99e9-5039b2a7eb5f.filesusr.com/ugd/82d61e_3404fb9ffcfc4006b5f86e862ac5fb4d.pdf?index=true
    • https://ef9d90ca-5811-4a1c-810e-75bcfae60121.filesusr.com/ugd/a33af7_c4354689db4645869f80057d2abd0456.pdf?index=true
    • https://6e678f60-abc6-404c-883a-cd1729fdffee.filesusr.com/ugd/e4291f_4504bafb60194810ab204f8aed6811de.pdf?index=true
    • https://8e75e8be-0f37-480b-85ac-641553c1acf9.filesusr.com/ugd/a4a1ce_75187d561dcb47ca856a3d96d2f6ff62.pdf?index=true
    • https://s3.amazonaws.com/xapidajovaji/dell_inspiron_one_2330_specifications.pdf
    • https://s3.amazonaws.com/vefagotoje/10837873843.pdf
    • https://80ce5912-1c67-4773-adf4-abf614566e91.filesusr.com/ugd/acb48a_2fd3236a45754cf3b3f0db3aafda7c7e.pdf?index=true
    • 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_off0000f63a.bin
17650f3487e02632c1d3a121cd2bd70eba41a65c0a80aa58233db6b99f324587		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF63A 5016 bytes
font_01_sfnt_off00010738.bin
fc1e76267dba4ae8aa8e67c32f46b7b81cca0e772da2aa62d9f60ddb7a4ca8e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10738 10592 bytes
font_02_sfnt_off00012b48.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B48 4324 bytes

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