Malicious PDF — malware analysis report

Static analysis result for SHA-256 1204d87c8b2a2396…

MALICIOUS

PDF

86.9 KB Created: 2021-03-12 02:16:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 2c6e0b6bd8a834a4f2a43c9ffcf531e2 SHA-1: c6738ce9eb84a97b290d7c312a4ba173893ab0a2 SHA-256: 1204d87c8b2a239698477ba12d8ed6ecd3ef3bc356c6da1e752e8a75065fe671
156 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many of which are SEO-optimized and point to potentially malicious content, as indicated by the PDF_SEO_LINK_FARM heuristic and ClamAV detection. The primary external URI, https://jacksth.ru/award?keyword=..., suggests a lure to a site that may host phishing content or a second-stage payload. No scripts were extracted, but the PDF structure and numerous external links strongly indicate a malicious intent to redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jacksth.ru/award?keyword=elimination+of+arbitrary+constants+in+partial+differential+equations+pdf PDF link annotation
    • http://stat-index-co.com/guzowezejedopinexg55yz.pdfIn PDF document text
    • https://jibudodenip.weebly.com/uploads/1/3/4/3/134364722/texibivaziri.pdfIn PDF document text
    • https://bozixezexa.weebly.com/uploads/1/3/4/8/134861503/f90fd.pdfIn PDF document text
    • http://bipiraxas.iblogger.org/29582867361.pdfIn PDF document text
    • http://kvrovk.xyz/operations_management_is_applicable_mostly_to_the_manufacturing_sectorm74qy.pdfIn PDF document text
    • http://izzzaaa.space/981366839ebgq4.pdfIn PDF document text
    • http://remont-pc.website/lulapetufomaxyh476.pdfIn PDF document text
    • http://kibixus.iblogger.org/how_to_track_my_american_eagle_order.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/daraniwekamidir/etq_8250_generator_parts.pdfIn PDF document text
    • http://sewegijod.rf.gd/aetna_dental_dmo_referral_form.pdfIn PDF document text
    • https://s3.amazonaws.com/mipeboro/standard_form_to_slope_intercept_form_generator.pdfIn PDF document text
    • https://0fdd9f25-8366-4660-9463-376fd915ad39.filesusr.com/ugd/c16cf9_ef17f310e6b64fe3a11bfc61d4aa9c9a.pdf?index=trueIn PDF document text
    • https://77047a80-9f17-4504-a563-a097c25ca12e.filesusr.com/ugd/5c8b2f_06dc697f68a84bc791b511a6aae951f3.pdf?index=trueIn PDF document text
    • http://bilodevufutumu.rf.gd/13329665686.pdfIn PDF document text
    • https://s3.amazonaws.com/zikeko/pamadufoxamezetubewitu.pdfIn PDF document text
    • https://s3.amazonaws.com/vexeliku/90461437826.pdfIn PDF document text
    • https://8b2103c5-345b-48fd-98e3-f19c90c4efd0.filesusr.com/ugd/0e2875_5afa662f78834ec7ab33dc6b38e6bc8e.pdf?index=trueIn PDF document text
    • https://ea74ff18-003d-4094-8454-8d7e15e33abb.filesusr.com/ugd/50de67_93652be611fa409bbc60c441ab6400c1.pdf?index=trueIn PDF document text
    • https://6eed613e-cbae-405e-b458-9655ef9033f8.filesusr.com/ugd/e4f6f0_c91a2195db4249568b0be56ae0bbb20e.pdf?index=trueIn PDF document text
    • https://fc060a1e-8c1d-4b7d-bafd-75f79d4c6355.filesusr.com/ugd/c0a468_d44365deb510495bb1a7eb069ff3a47e.pdf?index=trueIn PDF document text
    • https://e26976e3-f089-44cc-a2a6-54bcc6cae308.filesusr.com/ugd/0df15e_97fd989531634019be72edeaafe74ae4.pdf?index=trueIn PDF document text
    • https://ff06b2c9-6223-4357-b4d5-1bf3807c749f.filesusr.com/ugd/717131_95a52e048d2647a580ec57d3b44eda29.pdf?index=trueIn PDF document text
    • https://1350f94c-8d6f-42b4-8351-24983ad6a49a.filesusr.com/ugd/4aae87_9f05419c67a54518bfb2a27d1e09b09b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pujirageg/how_long_is_east_of_eden_book.pdfIn PDF document text
    • https://c918ad9e-99f7-49c9-8db3-c1be22914e11.filesusr.com/ugd/bcd086_29c4df06a744407dbac40b38c60afac3.pdf?index=trueIn 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_off00011454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11454 5628 bytes
SHA-256: 09954027ef05a50e1b54a07ebfce52470f7d562f6346e72d1061e51ee7b97d6d
font_01_sfnt_off00012764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12764 11236 bytes
SHA-256: fdc654024396e95a8662e40b98c4f93b6a35a9305359423d97ee05f212d9947e

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