Malicious PDF — malware analysis report

Static analysis result for SHA-256 be7082efa1e3de5d…

MALICIOUS

PDF

74.8 KB Created: 2021-05-31 16:11:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 7e8851162b46fb91e1e936edf785e08f SHA-1: 52f495f59965e43c8e24efb269a34f24df6d4c0a SHA-256: be7082efa1e3de5deb4ddfc697ff030ad1e9d91ffec22f6a56e2fd19028837f4
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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.
  • 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://smidgel.ru/pbw?utm_term=how+to+run+a+correlation+analysis PDF link annotation
    • https://nimizinimaji.weebly.com/uploads/1/3/4/7/134703428/zusitokawuruj_vewuse_mosurilugoge.pdfIn PDF document text
    • https://towutibe.weebly.com/uploads/1/3/4/0/134012467/dunuj-nakapino.pdfIn PDF document text
    • https://lidajegufevu.weebly.com/uploads/1/3/5/2/135299661/fac6e05d16.pdfIn PDF document text
    • https://nijawefevijabit.weebly.com/uploads/1/3/4/6/134665626/1989039.pdfIn PDF document text
    • https://dibodowe.weebly.com/uploads/1/3/4/6/134686502/jalobel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451039/normal_605c64f12cfa6.pdfIn PDF document text
    • https://vebexedupatad.weebly.com/uploads/1/3/2/7/132740253/1997510.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403823/normal_601249b5a00ff.pdfIn PDF document text
    • https://domolijetokuv.weebly.com/uploads/1/3/0/7/130738933/ribawixupawig-kajakowakezuf-povolojuluzer.pdfIn PDF document text
    • https://wevoxeloz.weebly.com/uploads/1/3/4/4/134403471/91d3e4.pdfIn PDF document text
    • https://jiwuzutobaduf.weebly.com/uploads/1/3/4/8/134889186/b97bf0a982434.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408871/normal_605fd29eb9d2a.pdfIn PDF document text
    • https://pabelazulutibus.weebly.com/uploads/1/3/1/0/131070827/5f6ebaf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad4cc4bc-f880-4d7d-b2d4-e4fbb8ba7bc8/66268885794.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b1713fc-51b5-4c0b-a572-18d94ab982a4/18748238930.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33b45460-b79d-4b70-bcc8-6718d47129f0/behringer_mixer_xenyx_1204_usb_manuale_italiano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a128bd42-4b25-4ff9-9b65-2efd565be2c0/weber_spirit_2_grill_cover_size.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3361646f-72ad-4e58-9492-61e27657bfaa/what_is_the_bright_white_star_in_the_sky_tonight_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71490199-2761-4504-960a-4459bdfa3a60/tokevugomipunukoxuge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9aca87b2-4d68-4325-a9e7-456d7e349302/76604634157.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bca4c64-94b2-4a77-8215-e06337d534b1/37665423280.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d291e441-c263-4249-beb0-1d96c4c53962/87502580501.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_off0000e7dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DD 4948 bytes
SHA-256: 78f0709e84a385db399d48eb537827ae97ded0b8ad16e160c13927fce9066c67
font_01_sfnt_off0000f8d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D2 10756 bytes
SHA-256: 19439049452669f4e04940b4de8193c53419a8fb3faf97772d95aa38d7c9b3ca