Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7a38cb2362b53d5…

MALICIOUS

PDF

84.4 KB Created: 2021-05-26 15:37:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 54d3fbe127dbf75d5a59330de06f84cf SHA-1: c3666a22ae25ae437e89ced3d512e9bca2fd7f1c SHA-256: d7a38cb2362b53d5fc1ebd2a763040f5af45d8f66a86ba4db966d9d22f59797a
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a link farm designed to redirect users to various other PDF documents, masquerading as a free download for a Python book. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, and the ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the presence of numerous external URLs and the link farm structure point towards a phishing or content-luring attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://fokemale.ru/strik?utm_term=introducing+python+2nd+edition+pdf+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465125/normal_6062744a36dc2.pdfIn PDF document text
    • https://turakenedonatup.weebly.com/uploads/1/3/4/6/134610331/158730.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467564/normal_5fe8e32440e24.pdfIn PDF document text
    • https://povilaromegew.weebly.com/uploads/1/3/4/4/134486615/259948.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476436/normal_5ff7704c78273.pdfIn PDF document text
    • https://borobufa.weebly.com/uploads/1/3/1/4/131406827/1873568.pdfIn PDF document text
    • https://vogavova.weebly.com/uploads/1/3/1/6/131606390/3644244.pdfIn PDF document text
    • https://sixumegeb.weebly.com/uploads/1/3/4/4/134476160/baxanukesaxe.pdfIn PDF document text
    • https://vefamomapebimid.weebly.com/uploads/1/3/1/4/131406391/a3466bd8bcc4.pdfIn PDF document text
    • https://miluxeto.weebly.com/uploads/1/3/5/3/135326788/465e6915.pdfIn PDF document text
    • https://sabuzirovapun.weebly.com/uploads/1/3/0/8/130813511/5750412.pdfIn PDF document text
    • https://pulijapejupexeb.weebly.com/uploads/1/3/4/0/134041872/fobirawiniwoze-diwozefu-vexiraluvud-dukepumo.pdfIn PDF document text
    • https://ramexolilaburav.weebly.com/uploads/1/3/4/3/134331107/7281759.pdfIn PDF document text
    • https://livadekawa.weebly.com/uploads/1/3/5/3/135317457/22c4002ba.pdfIn PDF document text
    • https://gefaturulabi.weebly.com/uploads/1/3/4/4/134487578/6057187.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/cfa5ffe6-932e-4d9f-82ba-4cb2b4126ceb/minuet_in_g_beethoven_guitar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91208c5b-7a78-431e-8283-4db22fc09d6f/what_is_intercessory_prayer_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c299fe07-cacb-46c8-923f-dc5c61450440/6428512473.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa0fe8fd-9d37-49bf-adee-f6d0b3215cb0/can_you_have_a_cdl_and_a_medical_card.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b697f72b-e9ab-45bb-8a76-b27548f1030b/retasenediboz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f74efc2e-9c31-4b4f-9cb7-56c9e3b795cb/naval_academy_ring_dance_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3dc206f-adfd-44b3-82c3-66de8b87f6f2/what_age_rating_is_your_lie_in_april.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b704c5b4-0271-485c-a637-3a9f47ed3ad2/21559583035.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02eb3d55-4396-470c-a14c-5d8432351396/does_superman_kill_joker.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_off0001090b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090B 5504 bytes
SHA-256: 7690d1ce73e1b67942051d2304cac408152bfae84a2329bb5cd3461c7969e998
font_01_sfnt_off00011bdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDF 11280 bytes
SHA-256: 13d64e37c3e72d4768461ea044ebc269bd1d3d41808d722164464c1f98c2186d

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