Malicious PDF — malware analysis report

Static analysis result for SHA-256 802a5cae8741f5ac…

MALICIOUS

PDF

78.5 KB Created: 2021-03-12 02:11:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 8e36c2c08d4bb3e7c900e235436cfdf0 SHA-1: a849b5a4556110ce4e9ef011e22e84be8efb35fe SHA-256: 802a5cae8741f5ac554c24c9f0c65d57106c7ebc4c810c4ab9940d3a97c242ba
186 Risk Score

Malware Insights

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

This PDF document was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. One prominent URL, https://jacksth.ru/strik?utm_term=asus+q502la-bbi5t12+battery+replacement, appears to be a redirector for potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://jacksth.ru/strik?utm_term=asus+q502la-bbi5t12+battery+replacement PDF link annotation
    • https://kerobasoxegetun.weebly.com/uploads/1/3/4/0/134017970/3146218.pdfIn PDF document text
    • https://zafapuguma.weebly.com/uploads/1/3/2/7/132712217/3720553.pdfIn PDF document text
    • http://paxijivatebul.getenjoyment.net/90121749820.pdfIn PDF document text
    • https://bazeliwelari.weebly.com/uploads/1/3/1/8/131857734/liwuzemebib_wubumodabaloz.pdfIn PDF document text
    • https://nakalefa.weebly.com/uploads/1/3/4/5/134522788/jodifemidovi-zabod-dalagokonup.pdfIn PDF document text
    • http://dumubemajizukov.medianewsonline.com/collecting_case_knives_identification_and_price_guide.pdfIn PDF document text
    • http://sowoxapexemex.sportsontheweb.net/perinubivamelaja.pdfIn PDF document text
    • https://webuwoterin.weebly.com/uploads/1/3/4/5/134589655/zatojijejiniduwulevo.pdfIn PDF document text
    • https://pavibizad.weebly.com/uploads/1/3/0/7/130740264/655f7ab9e12.pdfIn PDF document text
    • https://vozokeku.weebly.com/uploads/1/3/1/8/131857213/346435ec694330b.pdfIn PDF document text
    • https://radunepik.weebly.com/uploads/1/3/4/6/134617153/8a14c92707.pdfIn PDF document text
    • https://vavaxomutiposev.weebly.com/uploads/1/3/0/7/130738712/8c63be9eb6.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://cb47f074-0476-4434-b381-5672a365cab8.filesusr.com/ugd/c46c8a_3fe6f6cfad424f6492679bc2619ef068.pdf?index=trueIn PDF document text
    • https://3fb740b9-71d8-4183-8edb-de11b68c0a29.filesusr.com/ugd/1fbf8b_1f9c78e60278460494a8f1b66eab1890.pdf?index=trueIn PDF document text
    • https://443275ec-395d-4f86-84c9-2ed7a250e117.filesusr.com/ugd/7d471d_2a32fffd6b2d4c75af13266ee125dd66.pdf?index=trueIn PDF document text
    • http://tebaputazaxuva.myartsonline.com/how_to_change_door_direction_on_whirlpool_duet_washer.pdfIn PDF document text
    • https://0621cc9e-6449-4e8a-a8bd-baee9ad62a2c.filesusr.com/ugd/affb4a_cf23c5b4e42b479d967ac866d77a1f1a.pdf?index=trueIn PDF document text
    • https://78ff948a-0765-49f5-a22c-0fbe0eba7848.filesusr.com/ugd/888d0b_c83c71cf24ed4b9aa140d1798bb4da12.pdf?index=trueIn PDF document text
    • https://03ca3561-abfe-48ca-9b59-b1b2b77f8126.filesusr.com/ugd/1af49e_a4397a6dc0304130a47f55fab50393a9.pdf?index=trueIn PDF document text
    • https://05790d5e-93e9-4545-bcc4-99c37f081c18.filesusr.com/ugd/bff4d5_455b482b1fa34933a6740dfb5f8e0195.pdf?index=trueIn PDF document text
    • https://ea7788ad-ef5a-48b5-911d-3ad522045378.filesusr.com/ugd/f3bfbb_c89eb0215c464a77804313fac2e8c55e.pdf?index=trueIn PDF document text
    • https://2c8134a4-d865-4da1-8961-c755d7242105.filesusr.com/ugd/6dcf04_7cfbaf6cfedd4ea08040997d51c730d9.pdf?index=trueIn PDF document text
    • https://73e25548-3913-4bbb-aa69-a1b25f69568d.filesusr.com/ugd/cece23_e5b70405faef465bb44bf3a1245f614f.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A0 5688 bytes
SHA-256: 9cc9fac5f08222ed7d0c94bf4cab3c2aa9f5c1aac6a3c475a5f0602cfe0a24f1
font_01_sfnt_off0000f8f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F0 10956 bytes
SHA-256: 97dbcd690424abe09606ee67df80783289bc2b2d6022dc551814f5810d0b8dfe
font_02_sfnt_off00011e2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2A 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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