Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad24c4af5ebbce05…

MALICIOUS

PDF

79.3 KB Created: 2021-03-14 19:55:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 550160e300d2d644c4a3d544fb6e5808 SHA-1: ee5ce02fdf4f0fa3c7787c586795a15df26cac3d SHA-256: ad24c4af5ebbce052e346ab32ca667476dcbb5f1d2480748db1d49ea2a7c678a
164 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO abuse tactic. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or trojan distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious workflow designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://golowaki.ru/award?keyword=me6602+automobile+engineering+notes+pdf+download
    • https://kozenuxifojani.weebly.com/uploads/1/3/4/6/134665776/sarogufusurexejoz.pdf
    • http://bavujiburivege.iblogger.org/define_the_term_programmed_learning.pdf
    • https://jivetigaforivuj.weebly.com/uploads/1/3/4/3/134350389/be891cb.pdf
    • http://linza.media/likitunoguj4comv.pdf
    • https://bituxusod.weebly.com/uploads/1/3/4/3/134347303/1127345.pdf
    • http://testertumentum.space/junie_b_jones_seriesuallv.pdf
    • http://vegixojarek.iblogger.org/gapopujerusasojalijefupen.pdf
    • https://baliwiwun.weebly.com/uploads/1/3/1/3/131380001/fasesa-zixikevij-vigokak.pdf
    • http://medugogubi.22web.org/poem_comprehension_for_grade_8_with_answers.pdf
    • https://jetukuzimol.weebly.com/uploads/1/3/2/6/132695660/vuneda.pdf
    • http://digitaltoolsfor.xyz/bajonitovinevisemexawukwavp.pdf
    • http://prizinsta24.space/rewekebiruwanimmy82x.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://dileginaduke.epizy.com/72124852483.pdf
    • https://c6de0af5-2a4c-46da-924c-839bccb102c6.filesusr.com/ugd/5f1f0f_f8c41da5feb14369b3cea04b28367ea5.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a79d38a7-2305-497b-a045-94774ce80acc/bivunarewigunogexize.pdf
    • https://d56a38bf-d62e-453c-9b5b-5b2fe88aea46.filesusr.com/ugd/359e64_d100149839574edc997f1e1d7742fefb.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c50d1b96-837a-4cd1-a5f7-36ffe281ab26/letra_del_himno_nacional_de_honduras_coro_y_solo.pdf
    • https://2a082fd4-e93f-4b8e-9e59-408fa046b31c.filesusr.com/ugd/e334dd_6ad9cd8f340a479ba9add0195421a490.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6139b789-fe0e-4f29-a506-5c6728269291/tofuvamudinivumubumoxijam.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e917.bin
17d2891dae2629afeb5371d02eb234f391cc226459d35f9776ad26170dd0c246		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE917 5908 bytes
font_01_sfnt_off0000fd18.bin
33cbc8923b6ece9e82a7d4a863cb8ae45d802ea5be59f8eac4cc610d5546c1e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD18 10676 bytes
font_02_sfnt_off0001217e.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1217E 4324 bytes

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