Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e646a4bdcf5c029…

MALICIOUS

PDF

72.0 KB Created: 2020-11-19 07:21:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 336c38f45dbf1fec47075ed8e76fcb3c SHA-1: 1e9dcc91405d931db57470978c09db3313b59261 SHA-256: 1e646a4bdcf5c02946ea94af6c34f33259a88144f25d2124dc1b6c4d0e0f181a
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to Weebly and f-static.net domains, suggesting a link farm or redirection mechanism. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic point towards an attempt to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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
  • 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://traffnew.ru/aws?utm_term=video+er+ipad
    • https://xataramev.weebly.com/uploads/1/3/4/3/134320843/fewuwefuvufu.pdf
    • https://cdn-cms.f-static.net/uploads/4475720/normal_5fa8923fa6fd5.pdf
    • https://cdn-cms.f-static.net/uploads/4368250/normal_5f8f86ce7f6b4.pdf
    • https://wokozizexufam.weebly.com/uploads/1/3/4/2/134234926/e76402c7c067d3.pdf
    • https://cdn-cms.f-static.net/uploads/4404287/normal_5f92999013e7f.pdf
    • https://cdn-cms.f-static.net/uploads/4427514/normal_5f9b80873c3a3.pdf
    • https://cdn-cms.f-static.net/uploads/4422367/normal_5f9dcac67e263.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/ebf6af34-180a-4c11-801e-d9d0549afce4/84367480232.pdf
    • https://uploads.strikinglycdn.com/files/66d08422-fa6e-436a-a9c8-1ca6eb0b8f1d/62706069719.pdf
    • https://s3.amazonaws.com/gumagabu/sonowomufegalomavo.pdf
    • https://uploads.strikinglycdn.com/files/1547c435-713a-4d46-8632-baca2dcccf80/99606411728.pdf
    • https://uploads.strikinglycdn.com/files/356841e3-e859-4bb4-bb02-9e9b9fb757cc/kanokikaz.pdf
    • https://uploads.strikinglycdn.com/files/1394aa36-d1d9-4be1-a0f5-d3a9b907c4a4/31966902372.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1b2.bin
9733c79f245140552207303e301d541e5fdae145c3fa6d7a0c5af707f09412d4
pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B2 4312 bytes
font_01_sfnt_off0000e056.bin
fd466cdef77e6394e8fac4dc90a67d9bd0a081934a8ce3e271780d2281eeccc1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE056 10732 bytes
font_02_sfnt_off00010502.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10502 4324 bytes