Malicious PDF — malware analysis report

Static analysis result for SHA-256 83f4c88442f32998…

MALICIOUS

PDF

67.2 KB Created: 2020-12-15 19:59:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 78f355f1cd39afa463fc174429ce4257 SHA-1: 96dd2ea071c68b321328aacbfede1b63e02d4973 SHA-256: 83f4c88442f329987581e2cc87c46f0be8edf8b0f43d92d9dd33a3edebfd07af
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. One of the extracted URLs, 'https://trafffe.ru/aws?utm_term=metformin+er+vs+metformin+hydrochloride', appears to be part of this scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffe.ru/aws?utm_term=metformin+er+vs+metformin+hydrochloride PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4384307/normal_5fcef56770e41.pdfIn PDF document text
    • https://xuzufudoroxibu.weebly.com/uploads/1/3/4/7/134755415/4075297.pdfIn PDF document text
    • https://nojabepeteguki.weebly.com/uploads/1/3/4/6/134669956/rubegadulin.pdfIn PDF document text
    • https://mefupajudeto.weebly.com/uploads/1/3/4/8/134883840/8296642.pdfIn PDF document text
    • https://rirulejirosajis.weebly.com/uploads/1/3/4/3/134320684/jubefuteme.pdfIn PDF document text
    • https://kukotefuses.weebly.com/uploads/1/3/1/6/131637352/8c6df.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc4fbdee5c7695ca9b5b589/t/5fc5d5ea3f75b166439e7de1/1606800874353/hacked_games_unblocked_google_sites.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/774b5d78-ac81-438e-a64f-1fdaf346ca29/fekenezikidi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38c0aaf0-7259-4bae-8c38-759435471cbb/92775367454.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76b18015-ca55-49a2-892b-0653bb1e3fcc/lofalagojaxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8ed6fd3-c509-471a-a2a8-f249f4ed9ff5/xarote.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc4de962bbd7406581ff778/t/5fcea7cdcc997a768f5ab9e0/1607378893774/earn_to_die_2_game_hack_download.pdfIn PDF document text
    • https://s3.amazonaws.com/mixanaz/european_arrest_warrant_english_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d501b920-f540-486e-947e-ec703c9806c9/which_u.s._president_had_a_middle_name_that_was_just_a_single_letter.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_off0000c9d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D1 5220 bytes
SHA-256: 1ef9666edc5c97d2aad3fa79af0b25a2261d0aa7388287d798020d32bd2b4c65
font_01_sfnt_off0000db8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8A 10856 bytes
SHA-256: e7d3d9a3a5f6934a42c78004e24ac2a1a510c85e94c227a0aaf13e6f76849c6a

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