Malicious PDF — malware analysis report

Static analysis result for SHA-256 d35f72d5677c9c0b…

MALICIOUS

PDF

78.2 KB Created: 2021-03-20 07:43:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 893bd52f3306c981f9b5d9e40aed37e8 SHA-1: b930b5e865f470193e67401926310c3ebaf5e1e2 SHA-256: d35f72d5677c9c0b712337ba4fcf5b7b62be9a37bf8762fc80d33ba47476c149
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was identified as malicious by multiple heuristics and an ML classifier, specifically flagged as a phishing-related trojan. It contains a large number of external links, many hosted on disposable domains, suggesting it functions as a link farm designed to redirect users to potentially harmful websites. The document body, though heavily obfuscated, contains metadata related to software downloads, reinforcing the lure of accessing external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://fokemale.ru/123?utm_term=bomb+it+up+apk++old+version PDF link annotation
    • https://cdn.sqhk.co/sewuvavimebi/gcjd0DW/16343244899.pdfIn PDF document text
    • https://cdn.sqhk.co/nivuduful/rN4hehf/ferazusaviwapubujoja.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382190/normal_5ff68569792ff.pdfIn PDF document text
    • https://cdn.sqhk.co/pabelewexo/ZEBjeAb/3813693110.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452834/normal_5fd88c24b5ba6.pdfIn PDF document text
    • https://cdn.sqhk.co/wibetaxor/ids2ayz/90576800410.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412413/normal_5ff287861d4b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426972/normal_60554eca33aa4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383917/normal_604dc2d88ec20.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447914/normal_5fcb5e97b3fde.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446151/normal_602d642160e3c.pdfIn PDF document text
    • https://cdn.sqhk.co/zetobazox/rjfiejb/81329899923.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e6c529cc-411f-4195-b5ea-7b5fd081490a.filesusr.com/ugd/b7ab08_9eb704b714014746a58c0bb904dbbcb5.pdf?index=trueIn PDF document text
    • https://ce2645ba-e89a-43d5-afff-5c0150757291.filesusr.com/ugd/c63dba_9ab16cbfc502464a96919d7986a00676.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/backyard_baseball_free.pdfIn PDF document text
    • https://0efdb04f-128a-4c0d-ace4-8b312723ebcc.filesusr.com/ugd/5508f4_5e8ccfe7f2a444c798fe0f1966088e59.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/falufusu/gangster_movie_movies_counter.pdfIn PDF document text
    • https://14da0a27-f261-4d4b-8668-3a369f5c966d.filesusr.com/ugd/46429b_90159bf6f5a94d3a8f00f55dbd15d644.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/semuxemakaw/45050381407.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/grade_1_math_worksheets_canada.pdfIn PDF document text
    • https://s3.amazonaws.com/fogibi/87672419003.pdfIn PDF document text
    • https://s3.amazonaws.com/buponuwebi/irs_publication_17_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/jexijer/chrono_cross_psx_pt_br.pdfIn PDF document text
    • https://s3.amazonaws.com/wovigebi/shareholder_agreement_format.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_off0000f3d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D8 5420 bytes
SHA-256: 36f130aa6c7c3f3679802dad33e1c3f24863d92e6c0e9c0c4101a1da3f936e98
font_01_sfnt_off0001062b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062B 10824 bytes
SHA-256: f41100d1add188dafd3577065ab1db6744161899dbf8f1d412d11b3e447188e4