Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e85667ec8579b36…

MALICIOUS

PDF

72.9 KB Created: 2021-02-25 05:45:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: f97a01c356888922ebdcfe2208bb4458 SHA-1: a5f5ed11607d09fdd7d773e5dfaa28c445adfe17 SHA-256: 3e85667ec8579b367b99fdc03dd6833259bafe18801c7448f73c3ab5dac39c7e
204 Risk Score

Malware Insights

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

The PDF contains embedded links pointing to known malicious redirector infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The document body, though heavily obfuscated, suggests a lure related to 'Kawasaki vulcan 500 bobber kit', likely a pretext to disguise the malicious intent of the embedded links. The presence of multiple links on disposable hosting further supports a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://yafferge.ru/wix?keyword=kawasaki+vulcan+500+bobber+kit In PDF document text
    • https://static.s123-cdn-static.com/uploads/4483082/normal_5fdcb3e42f02d.pdfIn PDF document text
    • http://smartcoin.design/how_to_make_cool_science_experimentst5m4z.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455684/normal_6005b90dcdd33.pdfIn PDF document text
    • http://kisiguvawatabom.22web.org/pes_2018_smoke_patch_execo_aio.pdfIn PDF document text
    • https://cdn.sqhk.co/zuxosutuku/jkjbu52/cnc_machine_cutting_tools_companies.pdfIn PDF document text
    • https://cdn.sqhk.co/tategupet/J0jgb4Q/vuvedujixar.pdfIn PDF document text
    • https://tetunabirudav.weebly.com/uploads/1/3/0/8/130874278/7339180e85bd26.pdfIn PDF document text
    • http://gidujepeparu.22web.org/98878589842.pdfIn PDF document text
    • https://cdn.sqhk.co/riwaxagi/hjiw12M/old_phone_ringtone_android_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445343/normal_60108009735f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489583/normal_601ecd0edffc9.pdfIn PDF document text
    • http://italylife.pro/38331173370ex48p.pdfIn PDF document text
    • https://turakenedonatup.weebly.com/uploads/1/3/4/6/134610331/24ec63ac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493890/normal_60013ebd22d61.pdfIn PDF document text
    • http://reduslimitaly-ufficiale.website/gosexepenanuduwotepamixctmdr.pdfIn PDF document text
    • http://raketun.22web.org/mavibujaki.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gemewepibi.rf.gd/how_he_loves_bethel_bpm.pdfIn PDF document text
    • http://jivemewogipalen.rf.gd/48953274230.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_off0000e093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE093 5384 bytes
SHA-256: c1ef7d67130f31e8898b461964a7816494dcf632b588816889aa7b3e26c07ede
font_01_sfnt_off0000f310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF310 10364 bytes
SHA-256: 28aac9caf8238d83599bf9348eb04cc89ba78d46a710220d5d794cc5ab44b535

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