Malicious PDF — malware analysis report

Static analysis result for SHA-256 a343a559befab1fc…

MALICIOUS

PDF

79.2 KB Created: 2021-01-17 14:27:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: c4a38ee416254d5bcc4b40fab9337b0a SHA-1: 725b7feedf4b1cf147c144b3e1a824d0bf5d84f0 SHA-256: a343a559befab1fc4398cf3eab4e6d830635a7bdb8ebeefa20bcd2df03394707
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. Several URLs point to disposable hosting services, suggesting an attempt to obscure the ultimate destination or host malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffset.ru/aws?utm_term=walmart+crib+mattress+sheets PDF link annotation
    • https://gibejeki.weebly.com/uploads/1/3/1/4/131438187/wopagokabuz.pdfIn PDF document text
    • https://site-1173941.mozfiles.com/files/1173941/call_of_duty_mobile_garena_download_pc.pdfIn PDF document text
    • https://site-1174183.mozfiles.com/files/1174183/rikirukilaxenajovap.pdfIn PDF document text
    • https://pepadamive.weebly.com/uploads/1/3/4/4/134468065/kulalagagiv-videdulo-xopera-xixufe.pdfIn PDF document text
    • https://site-1172776.mozfiles.com/files/1172776/one_punch_man_destiny_ranks.pdfIn PDF document text
    • https://kujituxozi.weebly.com/uploads/1/3/4/6/134625238/tuzubopuxukuval.pdfIn PDF document text
    • https://site-1176827.mozfiles.com/files/1176827/anaconda_3_windows.pdfIn PDF document text
    • https://jokuduzasaru.weebly.com/uploads/1/3/1/3/131381103/futina.pdfIn PDF document text
    • https://vijejomikozo.weebly.com/uploads/1/3/4/6/134668467/c3ad56b0b691.pdfIn PDF document text
    • https://powizosiki.weebly.com/uploads/1/3/4/0/134041047/3422822.pdfIn PDF document text
    • https://lotigasi.weebly.com/uploads/1/3/4/7/134705720/nubibufixavuwenemi.pdfIn PDF document text
    • https://dudezixibuwido.weebly.com/uploads/1/3/4/5/134529197/e58cbc3b53.pdfIn PDF document text
    • https://lorujuxivole.weebly.com/uploads/1/3/4/5/134595667/163454.pdfIn PDF document text
    • https://site-1220223.mozfiles.com/files/1220223/callaway_gardens_lodge_and_spa_directions.pdfIn PDF document text
    • https://limejanokevipa.weebly.com/uploads/1/3/0/7/130739330/wagukuparamapazano.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/xonaxevetaf/residential_lease_agreement_format_in_tamil.pdfIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/2297461373.pdfIn PDF document text
    • https://s3.amazonaws.com/gaxuremewuger/basuwimi.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzed/investigative_consumer_report_notification.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_off0000f78a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78A 5192 bytes
SHA-256: 0d711d02a42f894d07815902f19f16d42b7a791ef2e8721c28af25fc1ce4f50a
font_01_sfnt_off00010910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10910 11324 bytes
SHA-256: 8a0ed9a52cce47ccd282d6d3385ad1d0cd8c62abbb25fb7997ab72bd23534144

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