Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ab251fb9ad1995c…

MALICIOUS

PDF

73.9 KB Created: 2021-06-06 23:56:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 074dd79def77982e88929a4b0b8f2a50 SHA-1: c59f16547f5e1d88711eb03c66c81a2066ff98fa SHA-256: 6ab251fb9ad1995c73c5fb2276ca32dea4d89c36157cb67032d5d25a1281d5fb
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS, indicating a high likelihood of malicious intent. The presence of numerous external links, such as 'https://wastran.ru/pbw?utm_term=flight+simulator+release+time+australia', suggests an attempt to lure users to external sites. ClamAV also detected this file as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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
  • 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://wastran.ru/pbw?utm_term=flight+simulator+release+time+australia
    • https://cdn-cms.f-static.net/uploads/4421612/normal_606e619d0fb1c.pdf
    • https://rogenogenitel.weebly.com/uploads/1/3/4/3/134316557/raguvasepefajev_xemiwimolager.pdf
    • https://vejiledulibona.weebly.com/uploads/1/3/4/3/134318828/b94de6ca04419ce.pdf
    • https://gitojigobireko.weebly.com/uploads/1/3/4/5/134517815/povegivudumut-kafad-meluvox.pdf
    • https://tapebosipufadiz.weebly.com/uploads/1/3/4/3/134366988/c77f3c9.pdf
    • https://cdn-cms.f-static.net/uploads/4427268/normal_602e8369cae55.pdf
    • https://cdn-cms.f-static.net/uploads/4391326/normal_5fe7ade2cb1cc.pdf
    • https://tuzunogosur.weebly.com/uploads/1/3/0/8/130815213/848c5d6c55a5851.pdf
    • https://koxokigibobov.weebly.com/uploads/1/3/4/6/134600250/gokopigilegutopitamu.pdf
    • https://suveruwifofe.weebly.com/uploads/1/3/1/3/131380558/7546488.pdf
    • https://zeniladafisu.weebly.com/uploads/1/3/5/3/135320186/063afbcff679.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b0e42f68-3c7a-4147-a30d-8124ec34b007/air_force_1_low_white_custom.pdf
    • https://uploads.strikinglycdn.com/files/0341a71a-30d6-4c2b-8e55-96ef6e4b3d5b/public_speaking_contests_for_high_school_students.pdf
    • https://uploads.strikinglycdn.com/files/8c8eab1f-f5ac-4417-b10b-6017e635e791/javisu.pdf
    • https://uploads.strikinglycdn.com/files/cc4d217f-5be6-47e2-bfcf-2cc590829ec1/what_is_the_five_digit_code_for_a_sanyo_tv.pdf
    • https://uploads.strikinglycdn.com/files/417caefe-141e-4cd8-b8f7-410f4cd82c5b/7093277279.pdf
    • https://uploads.strikinglycdn.com/files/9cd8492d-33c2-440a-a137-035349aec379/60483894619.pdf
    • https://uploads.strikinglycdn.com/files/699dc37f-a497-4f68-bece-ec73d1011d2e/darejonum.pdf
    • https://uploads.strikinglycdn.com/files/19809dcf-fa18-430a-9679-87ffab33e480/dadewunipimuzo.pdf
    • https://uploads.strikinglycdn.com/files/25582486-8ed4-4bdc-859e-4ff88c525bf3/are_amana_refrigerators_any_good.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_off0000e45b.bin
384894ee6af6b3a66b0e07634be71c4d121153e6273e0556e237d05df4bc3bae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE45B 5052 bytes
font_01_sfnt_off0000f55f.bin
c70171ffd850755e8c2a90a6d0701d3bb40debadc17f8dced1941f7748ffce96		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF55F 10904 bytes

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