Malicious PDF — malware analysis report

Static analysis result for SHA-256 db236416c26d586e…

MALICIOUS

PDF

76.9 KB Created: 2021-01-10 17:43:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: c69a1a3c505e0d2fb8cbbe0c0ec0e996 SHA-1: 092216add1ce90c8ebf5c8e57d142b2703abe659 SHA-256: db236416c26d586ea6a0f90d90d9d7aef7d0ae906673355f89c50410fe5e65bc
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by both ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of a PDF link farm heuristic suggests the document is designed to direct users to numerous external URLs, potentially for phishing or malware distribution. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript, which could be used to facilitate these actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://traffine.ru/aws?utm_term=tamil+ayyappan+songs++malayalam PDF link annotation
    • https://site-1174558.mozfiles.com/files/1174558/mexuzonoxogafulojawawet.pdfIn PDF document text
    • https://muwujexowosis.weebly.com/uploads/1/3/1/4/131437891/4806187.pdfIn PDF document text
    • https://site-1175420.mozfiles.com/files/1175420/melody_ehsani_age.pdfIn PDF document text
    • https://site-1173675.mozfiles.com/files/1173675/mufodogez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366312/normal_5f89a2d245ac6.pdfIn PDF document text
    • https://mufalugibesenu.weebly.com/uploads/1/3/1/4/131453255/2488720.pdfIn PDF document text
    • https://site-1178798.mozfiles.com/files/1178798/prime_video_android_tv_apk_mirror.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365624/normal_5fcae4d115b60.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368471/normal_5ff92c64ed01b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/kijelopazekune/homeworld_deserts_of_kharak_multiplayer_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/paxivogedewilu/tidozogimonisazodujipeg.pdfIn PDF document text
    • https://s3.amazonaws.com/juvuraguvutoxif/19161849354.pdfIn PDF document text
    • https://s3.amazonaws.com/gixawetopoli/construction_kick_off_meeting_agenda_template.pdfIn PDF document text
    • https://s3.amazonaws.com/wujapu/anatomy_of_bones_and_joints.pdfIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE060 4684 bytes
SHA-256: 8974ba23084d5909d239c39b7bbeb0092fe3940db39405b1b1a82501b1804aa0
font_01_sfnt_off0000f028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF028 11888 bytes
SHA-256: 5fdd516589eb1ff16b4725a430db6b1f17352583aca7e39103f02c002e499b3d
font_02_sfnt_off0001170a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1170A 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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