Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b67f15ae7481bd7…

MALICIOUS

PDF

78.1 KB Created: 2021-04-02 15:47:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b9557b6a1b49c19ea874222988f161fb SHA-1: decba36db0a570fa0faca8b9b44f0e9d5c5a6834 SHA-256: 9b67f15ae7481bd76eab949f9bf713e1e6e2864fe9bbb216b58b6073935df9ec
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, identified by the 'PDF_SEO_LINK_FARM' heuristic, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier also indicate malicious intent. While no scripts were extracted, the presence of numerous URLs points towards a malicious document likely intended to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/123?utm_term=mariage+d%2527+amour+pdf+chopin
    • http://mosomupusafebin.medianewsonline.com/17330326926.pdf
    • https://jedewudozoj.weebly.com/uploads/1/3/0/7/130739070/biwitakolasuxigo.pdf
    • http://kajuzumanaz.sportsontheweb.net/59461057620.pdf
    • http://xofitazuregokud.mywebcommunity.org/la_nueva_defensa_fiscal.pdf
    • https://furedanoduribi.weebly.com/uploads/1/3/4/6/134681858/paveji.pdf
    • https://dimofusuraz.weebly.com/uploads/1/3/4/6/134677966/gajonebil.pdf
    • http://wovoradomumakil.medianewsonline.com/tomb_of_annihilation_anyflip.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a0ecc051-b3d3-46b3-a7e7-5b036cfcaccd/lg_d415_unlock_code.pdf
    • http://noxudabewoxedit.rf.gd/beowulf_translation_tolkien.pdf
    • http://nebobabag.rf.gd/budaya_jawa_barat.pdf
    • https://uploads.strikinglycdn.com/files/36d43676-e970-49b6-80c7-efbaf202accd/47471772742.pdf
    • http://nenedabex.rf.gd/zazusogipuperozafif.pdf
    • https://b25bb209-51d3-4c1a-b111-f3d6b026631a.filesusr.com/ugd/3bcfef_247fffabc3504ff78b306f262eba63c6.pdf?index=true
    • http://tikixowogozomi.epizy.com/34397464841.pdf
    • http://vobikeretuwof.atwebpages.com/68185122693.pdf
    • https://uploads.strikinglycdn.com/files/b7ef4a3f-ec47-461e-87ec-784df16dd5fa/40894585359.pdf
    • https://uploads.strikinglycdn.com/files/c61ac65f-08e7-4a92-a958-a3ca55b84bd6/how_many_calories_in_a_subway_footlong_cold_cut_combo.pdf
    • https://uploads.strikinglycdn.com/files/372497d9-a422-4ffa-8b5f-367d1fa2e7b7/bollinger_bands_strategy_python.pdf
    • https://uploads.strikinglycdn.com/files/192d38ae-9778-49b7-bbe3-0aa7f176b120/the_idea_factory_jon_gertner.pdf
    • https://uploads.strikinglycdn.com/files/9cd5fa3b-3b1d-4bfd-a11c-29bbf4811b8c/xojodujudura.pdf
    • https://43fe4710-460a-4ad3-90dc-2dd795c51528.filesusr.com/ugd/a32c20_2022602eaab74ef3912f123df4b064ba.pdf?index=true
    • https://7f58a6d3-5723-489e-a2bd-17fd91e1ddd5.filesusr.com/ugd/655495_11ea14b7d0584bacb5600632fcbc5b0a.pdf?index=true
    • 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_off0000f077.bin
12543a6e7af214b9adc8db88d143ee81be30e78fa8d08c181c9e3a818c945f58		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF077 5400 bytes
font_01_sfnt_off000102c4.bin
4af893298813ff37bffddd5092d4f45bb324e19ce9ffa0fb42c7d5797eeb1818		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102C4 11652 bytes

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