Malicious PDF — malware analysis report

Static analysis result for SHA-256 d39bdf01eacb41e3…

MALICIOUS

PDF

73.3 KB Created: 2021-02-17 01:38:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 8de453efd44f489ebd45538226e990be SHA-1: cd9eb01d1994f91bf167ae8ac1ae089eda8f9bf4 SHA-256: d39bdf01eacb41e373cbba791a37e7d233a0a159712f9856128284a1eb6948a3
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spamming tactic. The primary URL, 'https://bologen.ru/wix?keyword=jungle+heat+apk+mod', suggests a lure related to game mods or potentially malicious applications.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/wix?keyword=jungle+heat+apk+mod PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4448536/normal_5fe4558571ccf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419003/normal_5fcff36ed7553.pdfIn PDF document text
    • https://lasasozizo.weebly.com/uploads/1/3/4/0/134041343/8ee41dc403e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391340/normal_5fec1409ee0cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365608/normal_601eb8f16677a.pdfIn PDF document text
    • http://nevogixire.22web.org/98000104372.pdfIn PDF document text
    • https://cdn.sqhk.co/mafowixodi/URxZcjh/bupexepemotupizekeze.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366036/normal_60188877960a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470232/normal_602ae2a023dbb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390051/normal_5fd63a74a0c8b.pdfIn PDF document text
    • https://xowemaxixedire.weebly.com/uploads/1/3/5/3/135325030/ridufobutunijug.pdfIn PDF document text
    • http://support-copyrighthelpservice-about.com/bcom_1st_year_economics_notes_in_hindi8qhr8.pdfIn PDF document text
    • http://masterpowerpoint.com/income_and_expense_forecast_template01pk1.pdfIn PDF document text
    • https://niwitibu.weebly.com/uploads/1/3/1/6/131636677/4732910.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405925/normal_60078a180c040.pdfIn PDF document text
    • http://telgrm.site/72866555169x8h4j.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385880/normal_5fd93d67711d7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kikidexawudipox.epizy.com/best_cell_phone_for_hearing_impaired_canada.pdfIn PDF document text
    • http://lenixad.epizy.com/painting_process_for_sheet_metal.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_off0000e40b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40B 5152 bytes
SHA-256: a704a1a48261c2e21ff780d7f40cc52106e87d1982be586b9a49c803e0a4ac11
font_01_sfnt_off0000f570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF570 10156 bytes
SHA-256: cedf944a086f8f6cb44fc3aab785cdc653a9c5f54b0a5543064fedf9bbbd27a0

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