Malicious PDF — malware analysis report

Static analysis result for SHA-256 1617bc16621133e4…

MALICIOUS

PDF

67.7 KB Created: 2021-04-06 00:56:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eaeb0cad2a0758140f60aabbf6c183f5 SHA-1: b536ac9a1b0141dbe186df4185684204506702c9 SHA-256: 1617bc16621133e4c94683e3644d89ac468401a9e6211e47917cc3d90bc58463
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to benign content, but one specific URL, 'https://resalured.ru/123?utm_term=differentiation+worksheet+h', is flagged as unknown and is likely part of a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/123?utm_term=differentiation+worksheet+h
    • http://zakofim.iblogger.org/prevalence_of_iron_deficiency_anemia_in_pregnancy.pdf
    • https://suterigegopos.weebly.com/uploads/1/3/2/6/132695321/lisov.pdf
    • https://zipusuborulam.weebly.com/uploads/1/3/0/8/130814510/kubeged_fagodemefitebox.pdf
    • http://pusikoxelumide.iblogger.org/algebra_2_common_core_workbook_answers.pdf
    • https://lugijuvumefabi.weebly.com/uploads/1/3/4/7/134761930/nizozedisojuza-banagorutogano.pdf
    • https://guvolobojifo.weebly.com/uploads/1/3/4/7/134733869/d0e88.pdf
    • https://lulofaki.weebly.com/uploads/1/3/1/4/131453598/negesopodiveja.pdf
    • http://fazupefejivujuf.iblogger.org/kokimesa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/024f55bf-6fb6-4159-91e8-6d6f51c18012/novugiwevedelojojuja.pdf
    • https://uploads.strikinglycdn.com/files/80a4bc43-00d7-44fc-ae99-4b60beb723fc/95955646485.pdf
    • https://uploads.strikinglycdn.com/files/f45e8dd8-242b-4a57-b0f7-0a9c6bb170e4/katopozexi.pdf
    • https://uploads.strikinglycdn.com/files/8a5e45c5-e666-4943-abeb-d4752faf9e23/95979524655.pdf
    • https://19972ee8-34f0-4900-8009-9f590161cd02.filesusr.com/ugd/64db51_08964ea171f24592a5e915e5be3dd278.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a9f86cec-7d06-4f31-bce1-58fe7e427c1a/mn_motorcycle_permit_laws.pdf
    • https://uploads.strikinglycdn.com/files/84370608-0bed-4d8a-b303-fed4363c1b1a/giguv.pdf
    • https://1e8c0764-4a0f-46ab-84a2-5f63a8a44928.filesusr.com/ugd/6a0acf_19f4ab0464744a579096dfb25b6d088e.pdf?index=true
    • https://73099f28-10d5-4558-98a1-2f8dc61f1a2f.filesusr.com/ugd/f62eaa_1925e985453b4c2983874283bbc07b40.pdf?index=true
    • https://uploads.strikinglycdn.com/files/03fc84b9-e839-4b62-b4b8-367eca50e5da/words_that_start_with_e_that_are_positive.pdf
    • https://uploads.strikinglycdn.com/files/496e35db-c38b-4ff1-a168-a6341e1ab6c3/star_trek_discovery_series_3_episode_9_cast.pdf
    • http://taguramol.rf.gd/lajosefufigatopunijago.pdf
    • https://204833c8-abda-4421-8777-5048ee7dd919.filesusr.com/ugd/e30b7a_3870919238334b8ba7781f36b8c68476.pdf?index=true
    • https://3edbbcf3-b5b1-446e-9630-835d38fa79e0.filesusr.com/ugd/6908d7_c1432245739d406d9d3761de13286c76.pdf?index=true
    • https://34e223d5-b18a-4f89-96b3-7c58aa965d90.filesusr.com/ugd/440e29_bf23ec0dd5684549874e35d73910605c.pdf?index=true
    • http://tajafex.rf.gd/how_to_identify_dead_trees_in_winter.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cdd1.bin
890511ce701c476a1a4e3a609ee5b6a98637c6b167d6257cc4cd4bbe2345e9af		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD1 4976 bytes
font_01_sfnt_off0000ded4.bin
7afb516d921beb04f92b39ff1cb9ce80514d987c59f46a826bb7e333f37093b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDED4 10004 bytes

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