Malicious PDF — malware analysis report

Static analysis result for SHA-256 ada25dc26ac32256…

MALICIOUS

PDF

78.0 KB Created: 2021-03-16 15:40:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e1c050d9c2e774a1b3fe33f694f89923 SHA-1: b83158bb1a6ac30e28966ee2f3dd7ab16273760b SHA-256: ada25dc26ac322563bf59c6e7f4a76d7932976fedaf693346235aebdbecac801
184 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically pointing to a known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body, though heavily obfuscated, suggests a lure related to PDF conversion tools.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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/award?keyword=kindle+format+pdf+conversion In PDF document text
    • https://cdn.sqhk.co/pixazizaze/d7VRe4I/call_blocker_app_that_blocks_voicemail.pdfIn PDF document text
    • https://cdn.sqhk.co/dubikureta/iWVLiMj/mobile_homes_for_rent_in_horizon_city_tx.pdfIn PDF document text
    • https://sazizilas.weebly.com/uploads/1/3/0/8/130874530/4184363.pdfIn PDF document text
    • http://dusexixegiseves.iblogger.org/rodijafakilubevilumez.pdfIn PDF document text
    • http://bajexubazewa.iblogger.org/53799159285.pdfIn PDF document text
    • http://sevezor.scienceontheweb.net/kilidatagawitisumodipe.pdfIn PDF document text
    • https://cdn.sqhk.co/rifokinimito/ghejaSa/kafurotoxoxowusumi.pdfIn PDF document text
    • https://cdn.sqhk.co/xenivoronizu/jaighiE/color_wheel_hex_code_generator.pdfIn PDF document text
    • http://majikok.mygamesonline.org/bivod.pdfIn PDF document text
    • https://bibutijelogoper.weebly.com/uploads/1/3/2/7/132740620/5176356.pdfIn PDF document text
    • http://faripofijukevom.mywebcommunity.org/how_to_describe_a_poetry_book.pdfIn PDF document text
    • http://sakulog.sportsontheweb.net/vifexalusomegezobugume.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8eefcaf3-52f5-4123-8be5-b1f0aaeea45e.filesusr.com/ugd/1d3654_717b2362d3a34d3eb746944af9508d52.pdf?index=trueIn PDF document text
    • https://bea00909-aa88-4d38-ac88-e56db460b486.filesusr.com/ugd/923104_45bce6d85927494d86b2403485138316.pdf?index=trueIn PDF document text
    • https://f0ddeb88-3549-4a27-8821-6e3dd713f165.filesusr.com/ugd/2b74da_1949accc9ed44d418b81883d7d256eac.pdf?index=trueIn PDF document text
    • http://sabuxixu.epizy.com/lubudesarofozar.pdfIn PDF document text
    • https://393102e6-89af-4738-8cad-89662dba8dc5.filesusr.com/ugd/33a16d_f51d354f545846b6acdc37e1d3be8094.pdf?index=trueIn PDF document text
    • https://ff06b2c9-6223-4357-b4d5-1bf3807c749f.filesusr.com/ugd/717131_b493a3ef38564221853df8249ef7e2e4.pdf?index=trueIn PDF document text
    • https://7c3dd69e-6649-485e-b385-36acc2971cd6.filesusr.com/ugd/cf9ff1_2dc6190ba2af42da961c8d2d59f06796.pdf?index=trueIn PDF document text
    • http://xaxurotowikofew.rf.gd/33146380171.pdfIn PDF document text
    • https://9f349447-249b-4747-956a-316fe86e371b.filesusr.com/ugd/d2b720_f2aa27dac9a0410c8a588694fb507468.pdf?index=trueIn PDF document text
    • http://nixutiwo.rf.gd/away_from_the_sun_album.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_off0000f254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF254 5332 bytes
SHA-256: 739970e4a1d927a2e828f8ecc395dcd356819a59d64e820aae073338c4e664bb
font_01_sfnt_off00010466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10466 11328 bytes
SHA-256: f511299aed7c422ffe500ca9cac6f3f85d0407b34662b708e1f805ce6a498839

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