Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a8a6e31a4887943…

MALICIOUS

PDF

76.0 KB Created: 2021-04-24 09:32:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a238543a799e048302fa3d7a897854e8 SHA-1: c3ba80386239a963b357cd505cf4bd5f8ec952e7 SHA-256: 3a8a6e31a4887943e9c75053e942de0caeaf8690a7dbf694a1264d436577ff1e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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
  • 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://druttle.ru/strik?utm_term=best+motorola+talkabout+2+way+radios PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481055/normal_5fe8754f454fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465136/normal_602f0a7e46fac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491936/normal_60176fe18c045.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457573/normal_6033f14354c34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448991/normal_60210f61619cd.pdfIn PDF document text
    • http://rerulekoba.66ghz.com/sscanf_format_integer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370555/normal_600c483c99fda.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402262/normal_600335b41e490.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371258/normal_60689b9c503d7.pdfIn PDF document text
    • http://mipedinujit.22web.org/singer_fashion_mate_computerized_sewing_machine.pdfIn PDF document text
    • http://xipevufizokev.iblogger.org/kegisovoka.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://91c7bc9f-df77-4dbd-ae51-8bcf521f3e61.filesusr.com/ugd/1df9ea_163b59f991c9455980cf96696b8b75e2.pdf?index=trueIn PDF document text
    • https://2c5a832e-93c4-4ab0-bef0-969ef348d747.filesusr.com/ugd/cc5daa_48019261a0524bbb8e34342792cadc1a.pdf?index=trueIn PDF document text
    • https://bcd7deca-fd5d-492b-a220-d373ca515bc9.filesusr.com/ugd/12f4eb_f67bd109d4e940fe8954d2066b7d53e2.pdf?index=trueIn PDF document text
    • https://ee897e78-a157-4eb5-8a47-d615096087a2.filesusr.com/ugd/113e89_69470624801046b7b76ea8b95c32abcf.pdf?index=trueIn PDF document text
    • http://posowisame.epizy.com/alter_ego_b2_free_download.pdfIn PDF document text
    • https://df1882fa-13c5-42f1-8438-577935b594b9.filesusr.com/ugd/91932b_8c76abbeacb74ca2a78c4bd8bbecaa96.pdf?index=trueIn PDF document text
    • http://bikaxubu.rf.gd/rowdy_baby_hd_video_free.pdfIn PDF document text
    • https://c1d61d78-9bae-425c-b347-ee91470fe4f1.filesusr.com/ugd/60933b_0c36488d510742ffa38341a3b539fc7d.pdf?index=trueIn PDF document text
    • https://7722bba5-72ad-4d15-a72d-9ce9fbdcf1b5.filesusr.com/ugd/772ad5_b88b051669b6409a85ef540950c3cf38.pdf?index=trueIn 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_off0000ebcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCB 5548 bytes
SHA-256: 9e461f6c3e860cfc9856be06425e2d4e05bb04d135c547357a16b4493e20d87a
font_01_sfnt_off0000fea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA7 10552 bytes
SHA-256: 9d79ee13f82d4b307766c1747a80655b32a33d0eb27d4d304ba05256c346ecbd

Open this report in the interactive analyzer, or submit your own file for analysis.