Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d7fbb119c5bed65…

MALICIOUS

PDF

70.0 KB Created: 2021-02-16 07:46:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: c07d45bdcc012199a4513a63d73109de SHA-1: 246e7b8cdbf14a456b7a93c82e3d1a5c220901ae SHA-256: 3d7fbb119c5bed6578bf4b60b48062f012bfe1ff3d01679b7b450b5d9c4dfe1b
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by multiple heuristics and an ML classifier, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The primary URL, 'https://jacksth.ru/wix?keyword=eso+master+angler+guide', indicates a lure related to fishing guides, likely to attract unsuspecting users. No scripts were extracted, but the presence of numerous external links points towards an attempt to redirect users to potentially malicious content.

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://jacksth.ru/wix?keyword=eso+master+angler+guide PDF link annotation
    • https://dolunejasuvufa.weebly.com/uploads/1/3/0/7/130776008/9646191.pdfIn PDF document text
    • https://jawoxaze.weebly.com/uploads/1/3/0/9/130968973/juvaj_komonusipewo_xarukefonu.pdfIn PDF document text
    • https://juxibawazorar.weebly.com/uploads/1/3/3/9/133997202/af793.pdfIn PDF document text
    • https://jasutabaxe.weebly.com/uploads/1/3/0/8/130873915/wonuzevov.pdfIn PDF document text
    • https://cdn.sqhk.co/murafabu/04ijggA/nobogufumugowinun.pdfIn PDF document text
    • https://dewosuto.weebly.com/uploads/1/3/1/4/131453399/8028455.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481510/normal_5fec0c6c930a9.pdfIn PDF document text
    • https://cdn.sqhk.co/kurotevu/eicgeiL/22387223685.pdfIn PDF document text
    • http://anarchymedya.com/101027124787wfqz.pdfIn PDF document text
    • http://cucoupon.info/invicta_watches_for_sale_cheap8rj40.pdfIn PDF document text
    • https://cdn.sqhk.co/lisesemafo/gi0javy/online_slots_usa_no_deposit_bonus.pdfIn PDF document text
    • https://cdn.sqhk.co/vakanaju/KifgjR2/tiktok_app_install_jio_phone_tamil_download.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/fowonaxul/32954112349.pdfIn PDF document text
    • https://s3.amazonaws.com/wujanozo/videnetosakukefipa.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_off0000d83c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83C 5100 bytes
SHA-256: 6d2022cf7e6a3a11cbfb217d81233725bb778b21739054e1bd59674b025792c8
font_01_sfnt_off0000e97b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97B 9936 bytes
SHA-256: 1457e8c4f551123ebb32123ec2d12c0c8b2419ac4ec38766309577571eb2ec2a

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