Malicious PDF — malware analysis report

Static analysis result for SHA-256 aec9a98a41cd4586…

MALICIOUS

PDF

73.2 KB Created: 2021-01-11 01:36:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 8ef5906052bc52792f5813931c4a00bd SHA-1: 33f23a770e3aed68b7fec9b2cbd3ab83905222a5 SHA-256: aec9a98a41cd45862fd6679d3bf2499965f2a58acda02bf0313be2f0ac27b4cb
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many pointing to suspicious or disposable domains, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. One critical heuristic, PDF_MALICIOUS_REDIRECTOR_LINK, flags a URL leading to known malicious redirector infrastructure. The ML classifier and ClamAV also strongly indicate maliciousness, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://gettraff.ru/aws?utm_term=monthly+assignment+schedule+template In PDF document text
    • https://pareruli.weebly.com/uploads/1/3/4/8/134891857/mugaf_pisiw.pdfIn PDF document text
    • https://cdn.sqhk.co/goluxewimabu/dig7jev/dirasekunagebonu.pdfIn PDF document text
    • https://sizemerekev.weebly.com/uploads/1/3/1/6/131606963/5bed1c9297.pdfIn PDF document text
    • https://cdn.sqhk.co/sojowidaz/h8IgdIT/elite_car_concordia_sagittaria.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495240/normal_5fb6710db064a.pdfIn PDF document text
    • https://xosagosogasimaj.weebly.com/uploads/1/3/1/4/131453054/wodoga.pdfIn PDF document text
    • https://zufuleruzu.weebly.com/uploads/1/3/1/6/131637307/mofuwine_xogof_xobuleponew.pdfIn PDF document text
    • https://cdn.sqhk.co/nitunoda/hbBfjjV/tiny_house_builder_ontario_canada.pdfIn PDF document text
    • https://site-1174404.mozfiles.com/files/1174404/51771869846.pdfIn PDF document text
    • https://duxetaxegijojem.weebly.com/uploads/1/3/4/8/134870405/kopufela_movat_wovawufij.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/pevarijidasalop/78401629846.pdfIn PDF document text
    • https://s3.amazonaws.com/fodose/manual_cadmium_reduction_methods.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_off0000d52a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD52A 5380 bytes
SHA-256: fcf083571a7832944eed65e5730eb9a5a903d2bc79fd5c22ae8b555e0d45df65
font_01_sfnt_off0000e755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE755 10028 bytes
SHA-256: d74c5dd63feb2c9bef1bfead485bdac44b9812685ebe6caf5aa91a9d312ffed3
font_02_sfnt_off000109b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B8 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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