Malicious PDF — malware analysis report

Static analysis result for SHA-256 55227c75bfff1148…

MALICIOUS

PDF

80.2 KB Created: 2021-03-15 09:47:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 71b1e0db566693c3c44a0e2c90a187d7 SHA-1: a8b0a07874f7e9697c08431f09afd8744c018c3a SHA-256: 55227c75bfff114884c30db76e5255099c21c4bdcfef50d90fa62865332893bf
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model indicated a high probability of maliciousness. The heuristic PDF_SEO_LINK_FARM indicates the document contains a large number of external links, likely to facilitate a link farm or distribute malicious content. One of the embedded URLs, https://xajibur.ru/123?utm_term=transformer+bushing+c2+test, is a strong indicator of a command and control server or a phishing lure. No scripts were extracted, but the presence of numerous external links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://xajibur.ru/123?utm_term=transformer+bushing+c2+test PDF link annotation
    • http://wivaserana.mywebcommunity.org/85094474060.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485435/normal_601cd92c6e7ac.pdfIn PDF document text
    • https://bitojobuf.weebly.com/uploads/1/3/4/8/134892495/ff2aa4e17ed.pdfIn PDF document text
    • http://ryursew.space/acupuncture_points_chart_freeboxr0.pdfIn PDF document text
    • https://womazineput.weebly.com/uploads/1/3/4/8/134895737/9410822.pdfIn PDF document text
    • https://lodirunesu.weebly.com/uploads/1/3/0/8/130874391/10fbf67c6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382413/normal_5fedece55d539.pdfIn PDF document text
    • https://gitosupogule.weebly.com/uploads/1/3/2/7/132741155/2144381.pdfIn PDF document text
    • https://nunipotewisi.weebly.com/uploads/1/3/4/8/134892443/b7164.pdfIn PDF document text
    • https://vorapitejure.weebly.com/uploads/1/3/4/6/134605364/612db.pdfIn PDF document text
    • http://gugibugud.mygamesonline.org/oxford_discover_1_vk.pdfIn PDF document text
    • https://rijojuno.weebly.com/uploads/1/3/5/3/135310883/5a3278.pdfIn PDF document text
    • http://help-igcopyright.xyz/23200987509410nh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/widiku/davv_cet_2018_online_application_form.pdfIn PDF document text
    • https://s3.amazonaws.com/bulozor/student_loan_abroad_form.pdfIn PDF document text
    • http://pekafujojef.onlinewebshop.net/the_journey_of_man_a_genetic_odyssey_video.pdfIn PDF document text
    • https://s3.amazonaws.com/lurutopobi/pomofilurupatazugisugino.pdfIn PDF document text
    • https://s3.amazonaws.com/sudevejerifu/3971750564.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_off0000ef32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF32 5364 bytes
SHA-256: c942e72ee6935e834730cfc601d71847e0176a6583b9e2582c78fdf0d6e3667a
font_01_sfnt_off00010144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10144 10772 bytes
SHA-256: 548052b5ee147905c616485496a06cebb885b94aa67cfa91a2ae7a012c9b5562
font_02_sfnt_off000125e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125E0 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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