Malicious PDF — malware analysis report

Static analysis result for SHA-256 462816b90bb23c8f…

MALICIOUS

PDF

84.5 KB Created: 2021-02-23 21:41:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 0326d619528fec4c7ccfb22921d50307 SHA-1: d21fa78805e3a91190b219b36f91a230120f9c4f SHA-256: 462816b90bb23c8f41cb1c153c9bc204fab0fa5c4b4b9856cf331e1e257d7fa3
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam tactic to drive traffic to malicious sites. The primary URL, https://bologen.ru/wix?keyword=kingdom+rush+frontiers+hacked+premium+content+unlocked, indicates a lure related to game cheats, likely a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/wix?keyword=kingdom+rush+frontiers+hacked+premium+content+unlocked PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4460476/normal_5fd91ed7781d6.pdfIn PDF document text
    • https://wifadesar.weebly.com/uploads/1/3/5/3/135345928/6673972.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457577/normal_5fdea1045cb69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403266/normal_5fd0b7488b429.pdfIn PDF document text
    • https://cdn.sqhk.co/mimufedu/xp8T3ib/foborulozupiginis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416675/normal_6014535ecede3.pdfIn PDF document text
    • https://saxarewuvopa.weebly.com/uploads/1/3/4/8/134855039/4460ae.pdfIn PDF document text
    • https://cdn.sqhk.co/wevodapobu/fhcgjie/77499251007.pdfIn PDF document text
    • https://cdn.sqhk.co/tunaluvum/vjhYjbL/10017764108.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446770/normal_6016dfbe901c1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485309/normal_5ffbd7348554e.pdfIn PDF document text
    • https://wojebera.weebly.com/uploads/1/3/0/7/130775791/74a74.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499999/normal_600ae51b0437c.pdfIn PDF document text
    • https://nesiwebe.weebly.com/uploads/1/3/5/3/135399888/4570013.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381340/normal_60282f1493d54.pdfIn PDF document text
    • https://cdn.sqhk.co/mapelimujeku/haUShQY/85015799933.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391340/normal_5fc5f44c6c37c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460982/normal_6022d2ea44a8c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367004/normal_6019045d8fac4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/vukusa/12940122607.pdfIn PDF document text
    • https://s3.amazonaws.com/fogibi/38212616058.pdfIn PDF document text
    • https://s3.amazonaws.com/miledu/citing_references_in_apa_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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fedf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDF 5484 bytes
SHA-256: 478ab441db71130d7ed968580e94ed330c4d27ef10566da806ece707f4759ce3
font_01_sfnt_off0001114f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1114F 10640 bytes
SHA-256: 761de8455e14e6bc8c60114923a768011a3812a89ab037b1dfc3b140e75fb280
font_02_sfnt_off000135b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135B4 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361