Malicious PDF — malware analysis report

Static analysis result for SHA-256 b690757b7a96cbb7…

MALICIOUS

PDF

64.3 KB Created: 2020-12-28 00:16:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: f78c7f3cb0d0beeaa7e5173909198557 SHA-1: 20844bae4817438fbdd74005bca9440a5d980dd5 SHA-256: b690757b7a96cbb7a3a9e9f56c812a62da23224336a17ce112ab6fd61747553c
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs. The presence of many external links suggests an attempt to drive traffic to potentially malicious sites for phishing or further payload delivery.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/strik?utm_term=hexagonest+roblox+id In PDF document text
    • https://bitekiparoduj.weebly.com/uploads/1/3/4/0/134017536/netikavunabo_jebepab.pdfIn PDF document text
    • https://cdn.sqhk.co/fawabanof/hchbo7L/70532513151.pdfIn PDF document text
    • https://cdn.sqhk.co/filomada/geghhcd/coffin_dance_meme_piano_notes.pdfIn PDF document text
    • https://jedifubebevaze.weebly.com/uploads/1/3/4/8/134873515/jikatuwopizuza.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mujesogi/vopozumifitoxafit.pdfIn PDF document text
    • https://s3.amazonaws.com/xisakazelelinim/bhakti_movement_in_odisha.pdfIn PDF document text
    • https://s3.amazonaws.com/salade/whatsapp_without_bluestacks_for_laptop.pdfIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/chemische_formel_zeichnen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdb587e8-70f8-45e6-ad14-e97ba50a877a/23387549711.pdfIn PDF document text
    • https://s3.amazonaws.com/wufujudisu/4978991195.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd6a5ebd-088f-46c1-ae40-f32d75bff43f/79030370144.pdfIn PDF document text
    • https://s3.amazonaws.com/bolovopizonuki/competition_music_song.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/dimoguwuvata.pdfIn PDF document text
    • https://s3.amazonaws.com/bededuxotulapil/bahubali_picture_2.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/civ_5_science_victory_guide_reddit.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC045 5164 bytes
SHA-256: 551257a34bd960cbe3df460f17e833be6168e31d48efe31f0c6aa557c57fd2fe
font_01_sfnt_off0000d1dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1DD 10256 bytes
SHA-256: 8e4c14dc35caa4cefea19321e497aaa7f8fc65ac2ef9438fc6ac0be780599b46

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