Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ac0e3b1101e1d35…

MALICIOUS

PDF

74.7 KB Created: 2021-03-25 07:42:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 8f634ec075563fa8fee3a810ee566bee SHA-1: d3b0e8ef34d11eba7c462fad3ac28f365d2dd3f4 SHA-256: 5ac0e3b1101e1d35e964d1364c85b37108e956ec31f6cd0b921208d1134a5e18
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicative of a link farm or SEO spamming operation. ClamAV and ML classifiers flagged the PDF as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious or deceptive content, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/wix?keyword=must+declare+the+scalar+variable+sql+error PDF link annotation
    • https://dofewomal.weebly.com/uploads/1/3/4/5/134510420/9768789.pdfIn PDF document text
    • http://wiboratiraveguw.mygamesonline.org/30156810470.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383804/normal_5fffea6ef1d4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475212/normal_60307f6a6fbed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425533/normal_5ff20e9393b88.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373797/normal_5fdd06f4dd939.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491398/normal_5fe48f537fa6c.pdfIn PDF document text
    • https://newogevalofa.weebly.com/uploads/1/3/4/8/134898908/soxod.pdfIn PDF document text
    • http://zuzavepojul.mygamesonline.org/baterivatigivexugovanane.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/bdd4c98f-340d-4498-9a2f-c507a757634c/kepagemunefedibud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7dd94356-9a45-4ac9-9523-0d3e72c1d745/english_textbook_free_download.pdfIn PDF document text
    • https://3f5765b5-411c-4b28-96d1-a1e3b219bcee.filesusr.com/ugd/ca847e_da75c1c875a446a7a8d60e507fe91a20.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/34cf85cb-09ec-46cf-9e73-c9e95312d9bb/how_much_are_32_inch_tvs_at_walmart.pdfIn PDF document text
    • https://s3.amazonaws.com/kosamupim/pivudedeweronop.pdfIn PDF document text
    • https://s3.amazonaws.com/lusabifef/ruwanixopimutigazodepatop.pdfIn PDF document text
    • http://xipanizi.myartsonline.com/tidiwibaje.pdfIn PDF document text
    • http://sodowurivav.onlinewebshop.net/advocare_24_day_challenge_journal.pdfIn PDF document text
    • https://s3.amazonaws.com/gateme/bisorupafimekofogoka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adeb9430-d73f-4da1-918b-ca09aac495a5/dominos_dough_balls_ingredients.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c650fd9-ead8-4c14-8c2f-44395cedd218/medieval_2_total_war_modding_unit_stats.pdfIn PDF document text
    • https://8b2103c5-345b-48fd-98e3-f19c90c4efd0.filesusr.com/ugd/0e2875_01ee4c62a36c41adb2e5b9f416adaafa.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zibenoroduzuw/how_to_manage_conflict_in_the_workplace.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_off0000e2bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BF 5360 bytes
SHA-256: 055eaec55915200abe6216d0d5189baff95e0f36163a523538c56570e31d3224
font_01_sfnt_off0000f502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF502 11868 bytes
SHA-256: ed91bcbc5d221a3010d58d4c6e311611deee929789982ae0f3d265fe1ebf2f38