Malicious PDF — malware analysis report

Static analysis result for SHA-256 87ff3041ea1b617b…

MALICIOUS

PDF

81.2 KB Created: 2021-03-29 00:04:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7b9b5580658bdf08b9b83611260ea6a2 SHA-1: d062c38efa6f9081eb00f660fd4dacba34090e2a SHA-256: 87ff3041ea1b617b2f38ff194b066cf2dfa3e74247f2bcb25c1772b8974b2ad5
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are disguised as book downloads, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself is indicative of a lure.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/award?keyword=p90x+workout+book+pdf
    • https://cdn.sqhk.co/vefomatakin/bhfheie/28597929295.pdf
    • https://cdn.sqhk.co/nakunadubux/iWzWifL/smule_sing_karaoke_app_apk_download.pdf
    • http://kanurapubefuxo.iblogger.org/91084862364.pdf
    • https://rixagebama.weebly.com/uploads/1/3/0/7/130738507/piwazevefukapeb-bidibesege.pdf
    • https://cdn.sqhk.co/woxemumi/hdSjfPf/46319464977.pdf
    • https://tojewenegekov.weebly.com/uploads/1/3/4/5/134502344/sefubumujatupiz.pdf
    • http://megivisu.22web.org/mdcat_2020_download.pdf
    • https://liroxinumapidaz.weebly.com/uploads/1/3/5/3/135348088/1468941.pdf
    • https://bosowumajozidu.weebly.com/uploads/1/3/0/7/130740465/fd5fa99e.pdf
    • http://gowitobo.iblogger.org/muxapibagiveridixabos.pdf
    • http://bojexatonumeme.iblogger.org/nabobazebepanidafosowimaw.pdf
    • https://wepizowo.weebly.com/uploads/1/3/0/8/130813330/niziwixumupar-wijigewa-zatori.pdf
    • https://cdn.sqhk.co/dejuxafe/ji6osgh/5198264086.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://790985df-dfec-4a08-b509-00f37668cf87.filesusr.com/ugd/a421e3_bade6432b910479ba7d00b18c99f847f.pdf?index=true
    • https://0fe83ef2-ed6b-4f04-a52d-31fe3c58d8d1.filesusr.com/ugd/ade4e6_cefd19482edc45deba9a8bee99c0a85e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/82504077-0f02-448d-89d2-e68612f0cfdc/is_elite_appropriate.pdf
    • https://49b821e7-ee7e-41b4-809b-d0417b8c1ddf.filesusr.com/ugd/927743_012f532628df4f0bbafcbe5847b2edbb.pdf?index=true
    • https://e0220c8c-c322-4c33-af83-7c5b0fe00b66.filesusr.com/ugd/a771bd_75cbaa3d2cc944e79795225886e1b7c0.pdf?index=true
    • https://571cbd0a-ba82-408d-be6d-2df53a8fcfe5.filesusr.com/ugd/02af14_482b9355125f48c79fc54f73a407e50e.pdf?index=true
    • http://womajobepovig.epizy.com/18100028559.pdf
    • http://gedonisezif.epizy.com/sta_112_elementary_probability_theory.pdf
    • https://uploads.strikinglycdn.com/files/3faccc4b-4ba0-4cd7-aacc-38f3bdded0b8/shatter_me_series_box_set_amazon.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_off0000ff13.bin
8aa450b49f239d4a89d68e7098870f713588af39355c29d9dffa0e8969e516ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF13 5280 bytes
font_01_sfnt_off0001112a.bin
53fa1786bb674a0d5703bb599dc0c4a044e9b08a05998c0426687f7289ad0faa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1112A 10832 bytes

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