Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca5ac2e7ebeb6380…

MALICIOUS

PDF

76.5 KB Created: 2021-05-22 02:52:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 6f765bc89d244be47a4653d39206dd1e SHA-1: afb0fccea22981b6b51750c1390d175c182fee69 SHA-256: ca5ac2e7ebeb63806090cab921d385f2189d6c65f06d2aad121e35722ac05a81
184 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical alert for linking to known malicious redirector infrastructure. The primary malicious URL identified is 'https://crophysi.ru/strik?utm_term=kenmore+front+load+washer+error+code+fh'. While no scripts were explicitly extracted, the nature of the PDF and the presence of redirector links suggest an attempt to lure users to malicious content, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=kenmore+front+load+washer+error+code+fh In PDF document text
    • https://static.s123-cdn-static.com/uploads/4480880/normal_6002164dbffad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383450/normal_60425124f1488.pdfIn PDF document text
    • https://jejofiwapo.weebly.com/uploads/1/3/5/3/135312812/gejujutukotudud.pdfIn PDF document text
    • https://dolilifiwu.weebly.com/uploads/1/3/4/4/134401054/tubinik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391305/normal_604fd0abdcfb9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369760/normal_5ff2a4b5ed4d3.pdfIn PDF document text
    • https://dirasikazeta.weebly.com/uploads/1/3/1/3/131379856/98f5a.pdfIn PDF document text
    • https://rofoxanubojinud.weebly.com/uploads/1/3/2/7/132740779/e9c1a5d.pdfIn PDF document text
    • https://bugukafu.weebly.com/uploads/1/3/4/4/134490359/sabiwawa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413456/normal_6013aa9818168.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452199/normal_606b62f9106bf.pdfIn PDF document text
    • https://vokugovu.weebly.com/uploads/1/3/4/5/134598923/eb63a3788854d1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445869/normal_5fe53dfd0c31f.pdfIn PDF document text
    • https://tuxupifogufo.weebly.com/uploads/1/3/4/5/134594750/5302838.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/68f907c8-0ac2-47ee-b216-a02001cbd220/carta_poder_simple_ejemplo_como_llenarlo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9ab7617-ace3-4888-95ba-3fd5a3624a46/datawamege.pdfIn PDF document text
    • https://s3.amazonaws.com/pevarijidasalop/texos.pdfIn PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/73428732861.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cce9bab6-0044-4b24-b291-f71e9ef5f06b/mastering_the_7_spiritual_laws_of_success.pdfIn PDF document text
    • https://s3.amazonaws.com/fadadedezeker/80068396416.pdfIn PDF document text
    • https://s3.amazonaws.com/gelawiweza/simple_past_and_past_perfect_exercises_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cffda40-e6fe-40ca-8fe8-f3a1ebda76d4/16634428041.pdfIn PDF document text
    • https://s3.amazonaws.com/bezutu/38920251794.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f33826d0-343c-4d79-9cfc-81891022b1f0/how_to_make_nib_cone_for_tanjore_painting.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_off0000ef21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF21 5324 bytes
SHA-256: 4d1ff2811270f4b61bdfd5b4398c7f6c739be92d2098064d3419b1fb041792c2
font_01_sfnt_off00010126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10126 10320 bytes
SHA-256: 9d70887687b9cce3709b3f1c5b5e3e0bd0a0a0e8408ddeab0f4781eca4a29501