Malicious PDF — malware analysis report

Static analysis result for SHA-256 b188fb887776fecf…

MALICIOUS

PDF

70.2 KB Created: 2021-01-14 22:07:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 09e85f64384ba8372af389f7dbc6c6e2 SHA-1: b8a07c14f76caf06754c2d04671bcd3fc72d66a0 SHA-256: b188fb887776fecf1be361c8b7749923869aa2754352b3e4687d07dff2c22d14
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, identified as a link farm. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically a phishing or trojan distribution attempt. The embedded URLs, such as 'https://trafficel.ru/123?utm_term=nh3+polar+or+nonpolar' and numerous weebly.com domains, are likely used to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://trafficel.ru/123?utm_term=nh3+polar+or+nonpolar PDF link annotation
    • https://kugodago.weebly.com/uploads/1/3/4/4/134491336/e8631.pdfIn PDF document text
    • https://terodovob.weebly.com/uploads/1/3/0/7/130776228/79a126a57789.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375907/normal_5f89880ca300f.pdfIn PDF document text
    • https://denonifo.weebly.com/uploads/1/3/4/7/134709080/eef2721a6.pdfIn PDF document text
    • https://sazekunoteti.weebly.com/uploads/1/3/2/7/132740187/volezulowasifi-nexexotukabe-xikenu-kuxujavogejefar.pdfIn PDF document text
    • https://borotopod.weebly.com/uploads/1/3/3/9/133997632/fomogulomuwise.pdfIn PDF document text
    • https://site-1215606.mozfiles.com/files/1215606/pufalujex.pdfIn PDF document text
    • https://wepusiviji.weebly.com/uploads/1/3/4/6/134661614/4568798.pdfIn PDF document text
    • https://zugufavowi.weebly.com/uploads/1/3/0/8/130874222/venonapeburiwi-gegotulepiki-jopix.pdfIn PDF document text
    • https://godadonalizubo.weebly.com/uploads/1/3/1/4/131437317/muzunedadonoz_lexed.pdfIn PDF document text
    • https://toraboretopupu.weebly.com/uploads/1/3/4/7/134769369/2061907.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/jamokaroxoj/49606278998.pdfIn PDF document text
    • https://s3.amazonaws.com/rodigapigeta/bachelor_party_2_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/juvetaso/glycosylated_hemoglobin_report.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_off0000d743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD743 4864 bytes
SHA-256: 6035f95e9d76a6e580b06d630e78d1db56ebe415b4dc7b7bad4773bafc56f7c5
font_01_sfnt_off0000e7d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D0 10752 bytes
SHA-256: 6d1ead1069f383c28ae6d330a4e8a387ec40e87a633329130a657922881647d6

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