Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c24fefd4dbf78c9…

MALICIOUS

PDF

79.4 KB Created: 2021-03-25 14:50:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6ce5353eeb09574e9721f26fc7d7cf9 SHA-1: 7467947b5d0272bf4c17a8521b1dab21191de516 SHA-256: 8c24fefd4dbf78c91a4d021cce4b12383c59e9b7045eefe94c332a8ae851eb6f
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are part of a link farm designed to appear as search results for technical manuals. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lead users to phishing sites or download further malware. While no scripts were explicitly extracted, the PDF structure and extensive external linking suggest it's designed to exploit users seeking information, aligning with a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/wix?keyword=honeywell+thermostat+th5110d1022+manual
    • https://jurujixomegisi.weebly.com/uploads/1/3/4/7/134745805/b8885febb150.pdf
    • http://gedatidigog.sportsontheweb.net/54866770931.pdf
    • http://xivasupati.iblogger.org/74948255880.pdf
    • https://fexaxotira.weebly.com/uploads/1/3/5/4/135401388/detaz_waguzo_fibut_tevir.pdf
    • https://favobilumosuxo.weebly.com/uploads/1/3/4/7/134733594/lakigejosokagigub.pdf
    • https://cdn.sqhk.co/kipaselofuza/jajdhev/79961733778.pdf
    • https://doxezudira.weebly.com/uploads/1/3/0/7/130739714/4816732.pdf
    • http://bikelumonekodex.mygamesonline.org/norago.pdf
    • http://jorowijedo.mywebcommunity.org/numerical_recipes_in_fortran_90_source_code_download.pdf
    • https://cdn.sqhk.co/jasuxerazifo/RGq0heS/84107209000.pdf
    • https://tujilebofali.weebly.com/uploads/1/3/5/3/135398949/momer.pdf
    • http://jifarobajis.sportsontheweb.net/aeronautical_engineering_subjects.pdf
    • https://jitugexe.weebly.com/uploads/1/3/0/9/130969989/b951a4227bd.pdf
    • http://lugodapamaj.mygamesonline.org/67231358355.pdf
    • http://zedukibawubige.22web.org/74194647388.pdf
    • https://kozoniwapi.weebly.com/uploads/1/3/4/0/134016697/lopudibusube-jofilanutelex.pdf
    • https://kekufekogaj.weebly.com/uploads/1/3/4/7/134768560/beret.pdf
    • https://jomaredavox.weebly.com/uploads/1/3/2/3/132302995/madijuxapoxekem.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://panexomurubagu.epizy.com/how_many_flowers_in_the_attic_books_are_there.pdf
    • http://vasiruduwoju.epizy.com/fibebuzovilu.pdf
    • http://ditatunejapazik.epizy.com/fasaliwotutirajofi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f694.bin
071098061fae928b4e7c01b671921c1915509d3a5e3d7a3ed96dbaa6f69c4ce6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF694 5668 bytes
font_01_sfnt_off000109cb.bin
18953bd8c63e5e8f036b07ca96f15caa705752d7fe27197b4f26afc9213b00b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109CB 10940 bytes

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