Malicious PDF — malware analysis report

Static analysis result for SHA-256 efc35af2cd566a2c…

MALICIOUS

PDF

76.0 KB Created: 2021-06-13 02:07:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 12ffa73b08a3351a47827ed077573c19 SHA-1: 4ee27b0aa83631a0e2a3a280e03afe3325446fe7 SHA-256: efc35af2cd566a2cb1c262a524b2f85b11e464cc6786c8ba746a71bfc15356c2
194 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The presence of numerous external links, including one pointing to 'irlanc.ru', suggests a link farm or phishing attempt. The heuristic 'PDF_SEO_LINK_FARM' indicates the document's primary purpose is to host a large number of external links, likely to manipulate search engine results or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://irlanc.ru/pbw?utm_term=baaghi+full+movie+download+123mkv PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4382976/normal_5fc736dabcfb1.pdfIn PDF document text
    • https://vorebalulu.weebly.com/uploads/1/3/5/9/135962534/lokikikaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386335/normal_6046c87e813cc.pdfIn PDF document text
    • https://turonobofudub.weebly.com/uploads/1/3/4/4/134463989/4afcf57f6a35cbf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499629/normal_60c12d772a202.pdfIn PDF document text
    • https://kowulenube.weebly.com/uploads/1/3/2/7/132740682/323cc92805.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453721/normal_6037d4e7b6134.pdfIn PDF document text
    • https://tikodukika.weebly.com/uploads/1/3/0/7/130776738/8789322.pdfIn PDF document text
    • https://tiwebusimevadeb.weebly.com/uploads/1/3/5/3/135346158/sikuduzufojojekaz.pdfIn PDF document text
    • https://lujinelux.weebly.com/uploads/1/3/4/3/134361227/todaxowo.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4382406/normal_60b32fc29e19f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453537/normal_602b4d8ea7475.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482206/normal_60c081202697c.pdfIn PDF document text
    • https://nesojikav.weebly.com/uploads/1/3/1/3/131398336/cc6fd79957077b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458390/normal_605ff2c524ee0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://palixazoke.pbworks.com/f/sujizodakuz.pdfIn PDF document text
    • http://kekivozafiko.pbworks.com/f/a_dolls_house_part_2_script_free.pdfIn PDF document text
    • http://mumubib.pbworks.com/f/what_does_42_mean_in_hebrew_gematria.pdfIn PDF document text
    • http://kopiginawavu.pbworks.com/f/avengers_endgame_full_movie_in_english_free_download.pdfIn PDF document text
    • http://rivikixizub.pbworks.com/f/color_by_number_pokemon_pixel_art_2.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9F 5460 bytes
SHA-256: 80fe02be2ae0e612988dd2023e2e3857eb64d494616152a80a4197dec1f125e0
font_01_sfnt_off0000f130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF130 10340 bytes
SHA-256: 3d9859003930ea9ca99e366d92bf9c49d30ab4ba7fa94ebb9254c78f58b8f751
font_02_sfnt_off00011488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11488 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333