Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ac256ea4c7b67d0…

MALICIOUS

PDF

77.5 KB Created: 2021-04-14 07:54:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 4809d73fea761d1449e7206b7bbff8bc SHA-1: 18a62000982203d0c0cc99e4fbad6122f547975c SHA-256: 3ac256ea4c7b67d07c931da6416462d130e39408b7a585ff646696102ed9d880
156 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 5

  • 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.
  • 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://nipisod.ru/strik?utm_term=polynomial+remainder+theorem+khan+academy PDF link annotation
    • http://subikizivuwen.22web.org/dipulabofusuzutobitetubur.pdfIn PDF document text
    • http://nositadox.mypressonline.com/an_unfinished_life_jfk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448094/normal_606529804ef8f.pdfIn PDF document text
    • http://tafasizogir.22web.org/tepupapi.pdfIn PDF document text
    • http://veviwumifuvemuz.mypressonline.com/62491340655.pdfIn PDF document text
    • http://kosixanadiguf.iblogger.org/63952499296.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383149/normal_6020abe15d7c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494440/normal_605c66bbd39ee.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jonora/free_leaf_stencil_template.pdfIn PDF document text
    • https://s3.amazonaws.com/wolina/dagerebutatekutesevan.pdfIn PDF document text
    • https://s3.amazonaws.com/rilexazejuzovep/45097787726.pdfIn PDF document text
    • https://a4758657-6aaa-4003-b0f6-1957e800abfd.filesusr.com/ugd/70c1f8_be964ee6564b419fa0f9b0bb81ab96e0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pokixovuxik/candy_crush_saga_mod_2019.pdfIn PDF document text
    • http://lifimakapusijok.rf.gd/friedrich_nietzsche_german_pronunciation.pdfIn PDF document text
    • https://a7563df4-ba19-4d82-a8a0-b2470d957038.filesusr.com/ugd/61f964_cab58140236a402ab46ae71b55754688.pdf?index=trueIn PDF document text
    • https://2aa89031-56ac-4de1-b828-aabe99840ec8.filesusr.com/ugd/cf14a4_04b12de33f694f06a1ab5bd93f477dcf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/votubukaxogilix/nitrogenous_fertilizers.pdfIn PDF document text
    • http://gunagiweraji.rf.gd/blocky_cars_mod_apk_2019.pdfIn PDF document text
    • https://69b3109a-7cce-4514-9193-d2106d9976ab.filesusr.com/ugd/3c2969_b4362a2a35b64242827414d0f7d0d00f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/neporezofov/what_channels_does_directv_offer_in_4k.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3C 5168 bytes
SHA-256: ba9c243afbb6771e1390ef04e903a3f853c13b95dce6c6b8754f212b63f2b23c
font_01_sfnt_off0000ffa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA5 12040 bytes
SHA-256: 4e2d11e5bf652a6263ff88138e999011b94153a6d4a9a99af5f5758f5c6ae971

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