Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9b21e19c5a9ef01…

MALICIOUS

PDF

80.3 KB Created: 2021-06-04 20:44:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 550a9f1c5ae3ee7121fc72b94d4dbb2f SHA-1: 77dcc2ccdf0bf240fab37380a0a4c42fade6367d SHA-256: b9b21e19c5a9ef014cd49f64b67589374cf2d40fade99359153eb56a5111f829
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a large number of external links, including those hosted on Weebly and other platforms, suggests a link farm designed to redirect users to potentially harmful websites. The document body, though heavily obfuscated, contains references to 'wedding itinerary excel template' and 'wkhtmltopdf', indicating a lure to disguise malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://lozipotod.ru/123?utm_term=wedding+itinerary+excel+template
    • https://punokoguset.weebly.com/uploads/1/3/5/3/135351172/debaxi-bimipajaxije.pdf
    • https://dudunubute.weebly.com/uploads/1/3/4/1/134132035/84228c9deb3.pdf
    • https://cdn-cms.f-static.net/uploads/4416787/normal_601db499bd161.pdf
    • https://sidelajuma.weebly.com/uploads/1/3/4/3/134373989/losepu-jumadobedog-fixetelizawikor-fobazipivalamib.pdf
    • https://dunulukega.weebly.com/uploads/1/3/4/4/134442930/1503461.pdf
    • https://gasodugolulo.weebly.com/uploads/1/3/4/3/134375537/vijesemija-kulal-xusop-jojajifelojil.pdf
    • https://cdn-cms.f-static.net/uploads/4470035/normal_6055a81c04b4c.pdf
    • https://fogurasetaj.weebly.com/uploads/1/3/5/9/135961985/2340453.pdf
    • https://zujefimobob.weebly.com/uploads/1/3/1/4/131453463/209f33.pdf
    • https://tefuxaforubexo.weebly.com/uploads/1/3/4/4/134446539/11f3d29fe28b6.pdf
    • https://cdn-cms.f-static.net/uploads/4379374/normal_601f9a490fb8f.pdf
    • https://narimokilef.weebly.com/uploads/1/3/4/6/134603618/4881737.pdf
    • https://bekazavaf.weebly.com/uploads/1/3/5/3/135327011/vutekoka.pdf
    • https://cdn-cms.f-static.net/uploads/4379852/normal_60634fdc7a1d2.pdf
    • https://nolegajaji.weebly.com/uploads/1/3/4/5/134519786/dasedorusig_fokukipofowit_zojaxatuge.pdf
    • https://cdn-cms.f-static.net/uploads/4489237/normal_604b2cb36816d.pdf
    • https://potuvomominoneb.weebly.com/uploads/1/3/2/6/132683031/kimuve.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/b0175ad8-7c25-4e28-a427-02e4bc2e6632/nidix.pdf
    • https://uploads.strikinglycdn.com/files/03c8aea4-ec23-4a6c-bc06-a94ea5a67b46/66405852795.pdf
    • https://uploads.strikinglycdn.com/files/197cb2f0-fa64-403f-a712-58d953cb3122/59752492513.pdf
    • https://uploads.strikinglycdn.com/files/2dadfd8d-2db7-4ac4-bc5a-ae7d6cc0e1c7/97424762462.pdf
    • https://uploads.strikinglycdn.com/files/3926542b-0623-4aa2-a994-6158e9e3d50b/79852651273.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_off0000eee3.bin
92e6783dd424e7a7e637d92948873161116e9e46ac97bd6f13f534bbe4940b67
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE3 5076 bytes
font_01_sfnt_off00010017.bin
bf7cade25b53a605caeac8fe0fc552f21800c9da7ccf4dc665b6c4f5dfe02d91
pdf-font-stream PDF embedded font (sfnt) at offset 0x10017 10464 bytes
font_02_sfnt_off000123d2.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
pdf-font-stream PDF embedded font (sfnt) at offset 0x123D2 4324 bytes