Malicious PDF — malware analysis report

Static analysis result for SHA-256 172c5a67a7b4162a…

MALICIOUS

PDF

75.5 KB Created: 2021-03-20 15:59:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: cd5ed56b9b523560c3928ca2966eed4d SHA-1: 7e81fe21b92a74a55cd12742d0bfadf76e09f36e SHA-256: 172c5a67a7b4162ae358df951efbe8a107298c8a62253c1f4fd01b30f4802fe4
126 Risk Score

Malware Insights

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

The PDF contains multiple external links, with a high concentration on disposable hosting, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

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 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://soxebez.ru/award?keyword=income+certificate+format+pdf PDF link annotation
    • https://rixabala.weebly.com/uploads/1/3/4/7/134730828/mivojumagajobi-rorizoma-zabugixovife-mewijewinaxiwa.pdfIn PDF document text
    • https://bajumavo.weebly.com/uploads/1/3/4/4/134486103/9455e85fddba7.pdfIn PDF document text
    • https://retowukiri.weebly.com/uploads/1/3/4/5/134592720/pugizife_toxusuridez_bamage.pdfIn PDF document text
    • http://gukojedovarek.22web.org/business_english_writing_course.pdfIn PDF document text
    • http://domastmsk.space/irregular_plural_nouns_worksheet_6th_grade7wlqh.pdfIn PDF document text
    • http://natur-green.fun/highway_traffic_rider_3d_bike_racingp0zkb.pdfIn PDF document text
    • http://stebsmeh.space/what_are_the_5_best_vegetables_to_eattggn6.pdfIn PDF document text
    • http://ludoviguboxulu.22web.org/69908719198.pdfIn PDF document text
    • http://nesobaka3.xyz/59947165045neqyf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380082/normal_6000a754ede74.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470679/normal_6042dc77244be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366044/normal_605146e9095b9.pdfIn PDF document text
    • https://meboropob.weebly.com/uploads/1/3/2/7/132740462/4289201.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420599/normal_5ffa1bab48c70.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lobivovakebala.epizy.com/impossible_quiz_answer_level_43.pdfIn PDF document text
    • http://tofepabozamawur.epizy.com/workcentre_7845i_toner_waste_container.pdfIn PDF document text
    • https://4d75d3c9-3a4d-4df6-84ab-e48b83d723e5.filesusr.com/ugd/cdb50c_41b819c6a57b4150afe5a4a11893339f.pdf?index=trueIn PDF document text
    • https://34886cf3-15ed-44db-93e8-8979dc7c4cd7.filesusr.com/ugd/ea2c45_4294895cd73240349b2386f535f0a42d.pdf?index=trueIn PDF document text
    • https://36071b1a-d853-4ad1-bccf-0ed894d94038.filesusr.com/ugd/906e9f_47fa01453bb44475a5bd1882b4d105c3.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_off0000eb48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB48 5028 bytes
SHA-256: 3ef590767ecdde1dd4fcfaae0b79506ab567be45123a141216bb5dd8549159d8
font_01_sfnt_off0000fc4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4F 10624 bytes
SHA-256: 0a1c21c682d454ba039e755ba40aa9e9e760cbb62eef0098dca6b8adaaf3f37e

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