Malicious PDF — malware analysis report

Static analysis result for SHA-256 18acae8068fd36d2…

MALICIOUS

PDF

107.1 KB Created: 2021-02-21 20:29:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 45f1a9616fcb3a723cfe1e6ae5d2cfb4 SHA-1: 24c0940ebfbe66ed6cb7bea967acf4d3c97e8bc2 SHA-256: 18acae8068fd36d28a6dfccd5bcf962b89b93b6e16a3740ed7ed0cccde9be005
214 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, with heuristics indicating a link farm and a redirector to known malicious infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://yafferge.ru/wix?keyword=alex+clarke+benefit+street In PDF document text
    • https://virefogagivagu.weebly.com/uploads/1/3/0/8/130815228/9219129.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365634/normal_5fe6a725aaf99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387031/normal_5fe721c955148.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488581/normal_602064b1b57e5.pdfIn PDF document text
    • https://xanavixigusom.weebly.com/uploads/1/3/1/4/131453194/d7363e1d7af618.pdfIn PDF document text
    • http://garantiya62.ru/chroming_rose_heavy_birthday5p68l.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450625/normal_60244de010857.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411231/normal_5fda9483a232b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403561/normal_602d93c933fd2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451023/normal_6030a814a24ae.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/ropuba/cambridge_primary_english_stage_1.pdfIn PDF document text
    • https://s3.amazonaws.com/labitajaxatufib/me_vichara_song_hd_video.pdfIn PDF document text
    • https://s3.amazonaws.com/gonasidupij/bait_for_saltwater_shore_fishing.pdfIn PDF document text
    • https://s3.amazonaws.com/silubebebefuju/liwavovekegenaw.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_off00016777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16777 5136 bytes
SHA-256: ab2e892a685de13e96059ef7896b8744e80cf39257fcce66638a783a203915fa
font_01_sfnt_off00017907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17907 11148 bytes
SHA-256: 0c4399be3e4c52769a8dc378f377f95ba31218420a60efd8385b0cf51d5173d1

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