Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6e845f18c8b06e3…

MALICIOUS

PDF

72.9 KB Created: 2021-05-31 21:01:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 12592fe9af6e79ef42766f737873ea0b SHA-1: 54644f82cbb4982bd9ee7b327e2e02c2a25128d9 SHA-256: d6e845f18c8b06e3478449e71316c32e735b49b779cbe689fc3a5cd7b84e1192
176 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. The heuristic 'SE_CALLBACK_LURE' indicates the document attempts to trick users into calling a phone number, consistent with phishing or tech-support scams. While no scripts were extracted, the presence of external URIs and the overall detection suggest a phishing attack vector, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://coretry.ru/pbw?utm_term=report+lost+card+hsbc
    • https://rirudelibuwa.weebly.com/uploads/1/3/1/6/131606594/2891637.pdf
    • https://nowitijot.weebly.com/uploads/1/3/4/7/134716658/niziz-tazimizovid.pdf
    • https://static.s123-cdn-static.com/uploads/4471960/normal_60098915386fd.pdf
    • https://cdn-cms.f-static.net/uploads/4391899/normal_5fe9a7c67072a.pdf
    • https://cdn-cms.f-static.net/uploads/4413000/normal_604ca18d2a13a.pdf
    • https://static.s123-cdn-static.com/uploads/4484805/normal_5ffac5c79b7ae.pdf
    • https://cdn-cms.f-static.net/uploads/4481059/normal_6025a00698b4a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zopujoxobug.pbworks.com/w/file/fetch/144411420/72258990565.pdf
    • http://sizolasipape.pbworks.com/w/file/fetch/144412803/freundlich_adsorption_isotherm_problems.pdf
    • https://uploads.strikinglycdn.com/files/e42a8bde-fd9b-4db6-8fd5-5d3a680d8120/lekirelegakokisukevu.pdf
    • https://uploads.strikinglycdn.com/files/de7d151c-271d-4cb0-8241-0fb7287e7719/best_class_to_play_solo_in_diablo_3.pdf
    • http://nunaruribeg.pbworks.com/w/file/fetch/144411669/how_to_find_gmail_account_location.pdf
    • http://nagomax.pbworks.com/w/file/fetch/144421653/verbs_followed_by_ing_form_or_infinitive_exercise.pdf
    • https://uploads.strikinglycdn.com/files/88ff3127-d6a1-4b09-b5d3-3dc674458f39/28283182084.pdf
    • http://tazijebep.pbworks.com/f/77806212844.pdf
    • https://uploads.strikinglycdn.com/files/92ef18e7-753b-4c04-a231-3ef8651719d8/zakapexenavutejemuzakun.pdf
    • https://uploads.strikinglycdn.com/files/c04df636-8bf1-4bf3-b67a-8cd6f903ee62/14930973042.pdf
    • http://zezimin.pbworks.com/f/42016832839.pdf
    • https://uploads.strikinglycdn.com/files/f83a4dcf-c4a5-4686-8e18-d6e77472d9de/vatixuseroger.pdf
    • https://uploads.strikinglycdn.com/files/66d77fd1-2ec8-43aa-9270-d4a4e965b962/45442114630.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dea1.bin
55e7475bbadb563d94ab4c24b77d2b13228d00aa7d17a3836adeeb845ca79349		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA1 5308 bytes
font_01_sfnt_off0000f0a2.bin
2c62e9a831956ad9819f78275c913ad90aa743854dde22144998681e02eb217a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A2 11168 bytes

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