Malicious PDF — malware analysis report

Static analysis result for SHA-256 9446c0a4b37f81e1…

MALICIOUS

PDF

79.0 KB Created: 2021-02-19 02:47:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b63998f12325ade6a532997082bafa60 SHA-1: 77fa1eeef29a8759fddc9e8da5e00b12efc10e6d SHA-256: 9446c0a4b37f81e1df7a95d283653c7b8ecd64f49c45d0c14a11a3832111da3e
246 Risk Score

Malware Insights

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

This PDF document functions as a link farm, containing numerous external URLs that lead to various resources, some of which are flagged as potentially malicious or phishing-related. The heuristic 'SE_SECRET_RECOVERY_LURE' indicates a strong attempt to trick users into revealing sensitive information. The ML classifier and ClamAV detection further support its malicious nature, classifying it as a phishing trojan.

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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://seumenha.ru/strik?utm_term=object+oriented+programming+in+c%252B%252B+mcq+with+answers+pdf PDF link annotation
    • http://getcreditreport.info/acc_aha_lipid_screening_guidelines7xcbr.pdfIn PDF document text
    • https://surevasod.weebly.com/uploads/1/3/1/8/131856145/d42ac95ea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493881/normal_6007e30d54e34.pdfIn PDF document text
    • http://lovelid.xyz/acoustic_energy_aegis_evo_one_manualnojoi.pdfIn PDF document text
    • http://contentmedialiteracy.com/parallel_lines_and_transversals_worksheet_answer_key18ep3.pdfIn PDF document text
    • http://how2clever.com/share_chat_app_in_teluguoriq9.pdfIn PDF document text
    • http://byseles.xyz/kozomimadugufavidiredom8mhlw.pdfIn PDF document text
    • https://zenamuvevabun.weebly.com/uploads/1/3/1/4/131453902/36e19b.pdfIn PDF document text
    • https://gupaxapofigovi.weebly.com/uploads/1/3/4/3/134356466/xasuwumugivegowi.pdfIn PDF document text
    • https://wasizizinawuj.weebly.com/uploads/1/3/6/0/136096362/wuzonikiwabixolibomo.pdfIn PDF document text
    • https://biwawabagukolaz.weebly.com/uploads/1/3/4/7/134730268/pavedelivapo.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://musowafotoxipid.epizy.com/zakasake.pdfIn PDF document text
    • http://paborijobo.epizy.com/xoxarodud.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_off0000e5c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C0 5788 bytes
SHA-256: 9d16309fabb8cc099efa6a37c367aaa26fe49173a033a2d110e3fac7b03089f7
font_01_sfnt_off0000f945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF945 11536 bytes
SHA-256: c284194ee115b4b00ec5b09f17aeaaaee8ea0b31889cb76352967bbc4f8440bb
font_02_sfnt_off00012011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12011 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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