Malicious PDF — malware analysis report

Static analysis result for SHA-256 890050182db8335b…

MALICIOUS

PDF

67.5 KB Created: 2021-01-04 21:12:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: a3af7013bf303c62f732d7d1d1d8b0ab SHA-1: bfccd9ff87426f83bd6567d7b0d3fe78cc0bf868 SHA-256: 890050182db8335bb4d5b0c1ad9f567319c94d0b0642ab208472bb5b1168c49e
214 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'Recount addon download', suggesting a phishing or scam lure. The presence of numerous external PDF links, including one to a malicious redirector, indicates an attempt to drive traffic to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffine.ru/123?utm_term=recount+addon+3.3+5a+download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4406223/normal_5fa9e868c76a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470685/normal_5fc0980d5c987.pdfIn PDF document text
    • https://gegiwozik.weebly.com/uploads/1/3/4/7/134719936/9106230.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422136/normal_5f9c5eeee8799.pdfIn PDF document text
    • https://vodipewelo.weebly.com/uploads/1/3/1/6/131637384/7016128.pdfIn PDF document text
    • https://losanuritajog.weebly.com/uploads/1/3/4/7/134730792/mazabuzotad-kigulu.pdfIn PDF document text
    • https://vetidemilutuzu.weebly.com/uploads/1/3/4/4/134492936/xudezagupulam-xadokoxewupam-nawev.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2320b86-bfaa-4fb2-bfa0-c2134453cbba/fasazexupakisigagala.pdfIn PDF document text
    • https://s3.amazonaws.com/nitajosasa/destiny_2_crucible_maps_earth.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/tonopoxevolaga.pdfIn PDF document text
    • https://s3.amazonaws.com/dutuzanob/domumewalizok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e1c842f-c05f-4a72-8e63-bd705ea4afa0/bedwars_texture_pack_mcpe.pdfIn PDF document text
    • https://s3.amazonaws.com/nuruvapozixix/ansi_c_language.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_off0000cbad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBAD 5080 bytes
SHA-256: 995fd509f0f78a47aab1a29967457baa1e5a32984e9c352d1406c4c99a03b575
font_01_sfnt_off0000dd32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD32 10196 bytes
SHA-256: e9937627ed34a2c78f88db62a8c00477ddb548e3797b9d9c2dfba7d488780f91

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