Malicious PDF — malware analysis report

Static analysis result for SHA-256 e91a2e31850e42e0…

MALICIOUS

PDF

113.0 KB Created: 2020-12-27 11:57:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: f4a6a1994f325f77db7de5c2186d8f72 SHA-1: d13ca4fbb8799fc62adda57d8b7c57b4eea0f487 SHA-256: e91a2e31850e42e0f2807a5b63ed57a73b5fc4c48edab41034f37c154b6d0bb5
214 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, disguised as a movie download lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous embedded links suggests an attempt to create a link farm for SEO poisoning or to distribute further malicious content.

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://ggtraff.ru/aws?utm_term=bahubali+movie+free++in+tamil+hd In PDF document text
    • https://vofixerexelisat.weebly.com/uploads/1/3/4/3/134311693/suxuxovesugupukilod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372735/normal_5fd92f617111d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370309/normal_5fc907fdad459.pdfIn PDF document text
    • https://taguraridefukal.weebly.com/uploads/1/3/4/4/134446716/tafekilowajepi.pdfIn PDF document text
    • https://vidojibirulon.weebly.com/uploads/1/3/1/0/131070792/e7c9c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388421/normal_5fe663570d7f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469135/normal_5fc28a5969ab9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473375/normal_5fb44e23865e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411717/normal_5fdc17c9abdc0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371553/normal_5f88852a3c873.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wipotegadodorek/22952032528.pdfIn PDF document text
    • https://s3.amazonaws.com/nagudo/38721462269.pdfIn PDF document text
    • https://s3.amazonaws.com/tonisefoteka/dejesiwasodikufaxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdf4d49d-d9c4-419f-8e59-c5417460e525/how_to_get_free_fifa_coins.pdfIn PDF document text
    • https://s3.amazonaws.com/kalanejaxutilif/ruligonitezirinexeju.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_off000165e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165E8 6108 bytes
SHA-256: c106a799014d182053972e0e8159da634060f4bb447dbe3c55adda673cd0c744
font_01_sfnt_off00017abc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17ABC 5216 bytes
SHA-256: 1a31ae30067ed5b9e78ef6aad3abdc9d15da47b135a198658194103257835005
font_02_sfnt_off00018c58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C58 12972 bytes
SHA-256: 6a8146cf9480bad341e6370e198e52cbce5483795274cb08c6f2306c0c9e595b

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