Malicious PDF — malware analysis report

Static analysis result for SHA-256 a37a4bd3d45f69d0…

MALICIOUS

PDF

81.6 KB Created: 2021-03-14 01:36:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 49e4a6f6f40dba382416264da0ce347c SHA-1: 98f4bb0189925bc5615c9f9dec34b79369b2c135 SHA-256: a37a4bd3d45f69d045b3a5e036498cdd6b2d39512494a46b2d1c943b3b64f549
126 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which are associated with link farms and disposable hosting, indicating a phishing or malicious distribution attempt. The presence of a link to 'jottigo.ru' with a 'hp printer 2542 ink cartridges' UTM term suggests a lure to trick users into clicking for a fake offer. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware delivery.

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://jottigo.ru/strik?utm_term=hp+printer+2542+ink+cartridges PDF link annotation
    • https://wubepifumemav.weebly.com/uploads/1/3/4/1/134109226/nobef_folibumoj_dozodefaf.pdfIn PDF document text
    • https://cdn.sqhk.co/fabozesemi/auXkibD/xizudomezegejamuba.pdfIn PDF document text
    • https://cdn.sqhk.co/pemejurove/v08jeQs/29515043651.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489983/normal_5fef9c805c258.pdfIn PDF document text
    • https://dutizadip.weebly.com/uploads/1/3/4/8/134889078/a4631a046b546b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481527/normal_5fdf9be0c5ed6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498376/normal_600eae8fb2c74.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417659/normal_601389c255db9.pdfIn PDF document text
    • https://fudanologakobur.weebly.com/uploads/1/3/5/3/135394175/4416715.pdfIn PDF document text
    • http://sizoxuk.22web.org/68511737538.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485322/normal_600c37d53f2df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380545/normal_60325a5427f9c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385613/normal_5ffe92ca8636f.pdfIn PDF document text
    • https://cdn.sqhk.co/zofizitene/YieHDRd/hit_it_fergie_tiktok_sound.pdfIn PDF document text
    • https://jileninaniwepuz.weebly.com/uploads/1/3/4/7/134771173/5434165.pdfIn PDF document text
    • https://tovozilulu.weebly.com/uploads/1/3/0/8/130873983/78dddd25a491.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/nuxulikiwab/lalokerogixurejixak.pdfIn PDF document text
    • http://nawirowig.rf.gd/bulawulororogunegep.pdfIn PDF document text
    • https://s3.amazonaws.com/libusamagowuvo/61319250124.pdfIn PDF document text
    • https://s3.amazonaws.com/rafiralexezol/java_core_dump_analyzer_tool_free.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_off0001008b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008B 5576 bytes
SHA-256: 15b08d396b7609321382e5c1adcceafab48a7f8d3f45a924e8d6dde365c1f86e
font_01_sfnt_off0001139f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1139F 10916 bytes
SHA-256: 32f2fce8ad568adaf8cc345d7d0e34538400ee32440e7117283fb52fc793a5d7

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