Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b03fc5f0b93f9bf…

MALICIOUS

PDF

92.1 KB Created: 2021-06-09 02:24:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a035135b79a966870a11723e438eeef0 SHA-1: e1cd9fba265e014fed83c31d5f66d40b0e1ba0aa SHA-256: 2b03fc5f0b93f9bf22b0ac7dab34867c608c0e1444c8e493f20dc72b24e8d507
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains an embedded URI pointing to 'baarspo.ru', which is likely a malicious domain used for phishing or malware distribution. The PDF structure and embedded content suggest it's designed to trick users into visiting this external link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://baarspo.ru/123?utm_term=adblock+plus+safari+mac
    • https://cdn-cms.f-static.net/uploads/4500208/normal_6060db857c570.pdf
    • https://cdn-cms.f-static.net/uploads/4369765/normal_600a237f7c84c.pdf
    • https://cdn-cms.f-static.net/uploads/4485927/normal_601edd1320c00.pdf
    • https://cdn-cms.f-static.net/uploads/4372360/normal_603d01cb2fb3b.pdf
    • https://cdn-cms.f-static.net/uploads/4371799/normal_60bb2554a1c23.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xutosop.pbworks.com/w/file/fetch/144602658/32207030723.pdf
    • http://vimadutukad.pbworks.com/f/how_to_know_if_it_is_exothermic_or_endothermic.pdf
    • http://boxedaw.pbworks.com/f/debebobufusakegexetularow.pdf
    • http://devopiporo.pbworks.com/w/file/fetch/144727833/84104226325.pdf
    • https://uploads.strikinglycdn.com/files/b76ee52a-3268-4c41-afde-03db16ce3159/chief_mate_salary_in_merchant_navy.pdf
    • https://uploads.strikinglycdn.com/files/fdcf2d43-0b24-4558-8cb2-8169fc47ac5c/how_to_adjust_cobra_f8_driver.pdf
    • https://uploads.strikinglycdn.com/files/86bdfeb9-a34a-466a-aa1b-7a4857620444/91356679430.pdf
    • http://zuvevetub.pbworks.com/f/58416305256.pdf
    • http://fogofalo.pbworks.com/f/gofojanoji.pdf
    • http://vawijoj.pbworks.com/f/pibotifanax.pdf
    • http://nefusim.pbworks.com/w/file/fetch/144466065/how_do_i_file_a_puerto_rico_tax_return.pdf
    • https://uploads.strikinglycdn.com/files/d4f5190c-11ed-4caa-9e69-4b2f43cf62bc/fupajarekafobo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000112dc.bin
26b7b29ad9f2466c80b9d4d5b6fa4b71855989c0d26b9da0f2ddb8b2b16a4fd1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112DC 5492 bytes
font_01_sfnt_off00012578.bin
41878c9d88ad2abb6fa0fc5d059adb6e2cb20ebed80b31c7cce972cdf20a7a70		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12578 11852 bytes
font_02_sfnt_off00014e1b.bin
39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14E1B 16092 bytes

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