Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c0b5155593493bb…

MALICIOUS

PDF

74.3 KB Created: 2020-12-16 15:37:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a91870b92be9a153c745106de6f22538 SHA-1: 17a6526e41e32f25b8fea21d79dbfcfe88054d8b SHA-256: 8c0b5155593493bbc2bbf9659ca7ef60d0dd98ce2f7ce52c9dba8862e47e7269
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The document body, though heavily obfuscated, contains metadata suggesting it's a lure document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffmen.ru/aws?utm_term=voyage+of+despair+shield+upgrade+guide
    • https://cdn-cms.f-static.net/uploads/4390643/normal_5f924a0634e13.pdf
    • https://cdn-cms.f-static.net/uploads/4372681/normal_5fa0de2cdc750.pdf
    • https://kedixusivazusug.weebly.com/uploads/1/3/4/8/134869684/a3da232.pdf
    • https://cdn-cms.f-static.net/uploads/4368495/normal_5fd6df54c8593.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e55cc21f-5c3d-4940-a793-fd534a1c8979/vavusiguvibukemabazimol.pdf
    • https://uploads.strikinglycdn.com/files/90117e92-7659-4ce7-b544-ca204a374b5a/67521749102.pdf
    • https://s3.amazonaws.com/ligole/free_2007_chrysler_sebring_repair_manual.pdf
    • https://static1.squarespace.com/static/5fc514f09698b02c7f3b9635/t/5fce401a7ae85b53b2beb137/1607352348337/cardboard_cat_house_christmas.pdf
    • https://static1.squarespace.com/static/5fc538cf40f1034a5cc52c8a/t/5fcd4f0983d2ac65cc228c79/1607290633559/43642624520.pdf
    • https://uploads.strikinglycdn.com/files/4f43ab63-b987-4dbc-bca7-d4872cb7d844/5157967469.pdf
    • https://static1.squarespace.com/static/5fc110e9ff13940aa2409adf/t/5fc560ad18e72e5fdb8c0c88/1606770862015/753_area_code.pdf
    • https://uploads.strikinglycdn.com/files/17eb51c8-e45d-4a5e-9d5d-84f54d70b788/addscore_thai_2in1.pdf
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e477.bin
4c0f363448068030df50e0a8dd2f15c59084ca447c51373d79cc8fb87fa89e1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE477 5372 bytes
font_01_sfnt_off0000f6c9.bin
339ba39eb279be04a37a8f09723689b3db15218b2d901497422a168632279810		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C9 10680 bytes

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