Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd55260573f168b3…

MALICIOUS

PDF

81.9 KB Created: 2021-03-28 14:53:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 17f45e2264ea6b33808457c50a1395d9 SHA-1: 22d23a15b0c717aaa06d86fd52f0917e214e7c28 SHA-256: dd55260573f168b3e4427cacfb3ef688f99d0ce29d0def35a995f5187bc29e1d
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, indicating a link farm or phishing attempt. The document body, though heavily obfuscated, suggests a lure related to an 'answer key'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites for further exploitation or credential harvesting. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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
  • 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://dafemum.ru/wix?keyword=unidad+3+leccion+2+vocabulario+a+answer+key
    • http://help-verification.com/galvin_green_paclite_size_guideaw7kd.pdf
    • https://worojuwoxalo.weebly.com/uploads/1/3/0/8/130814432/59221.pdf
    • https://laverikiwife.weebly.com/uploads/1/3/4/5/134502667/925276.pdf
    • http://kulotufiw.mypressonline.com/gmo_crops.pdf
    • https://widuboxizivibib.weebly.com/uploads/1/3/4/3/134315701/laxexazawiwuligaw.pdf
    • http://spain50off.info/list_of_christian_martyrs24zgj.pdf
    • http://bisibometixo.mywebcommunity.org/what_is_a_spiral_curriculum_in_medicine.pdf
    • http://zekifafeter.scienceontheweb.net/kenyan_cake_recipes.pdf
    • https://pezuzaje.weebly.com/uploads/1/3/4/5/134577214/sikasumugu_sipava.pdf
    • http://tometifo.getenjoyment.net/pofakab.pdf
    • http://fagumawegoleleb.mypressonline.com/woletosudugo.pdf
    • http://bamirajewenexo.medianewsonline.com/lasanula.pdf
    • http://jewogipuwivi.medianewsonline.com/allison_transmission_reset_codes.pdf
    • http://gejesixave.scienceontheweb.net/stairway_to_heaven_bass_guitar_pro_tab.pdf
    • http://sollabs.xyz/xegiluzenesaroguwumewumugkzd65.pdf
    • http://portkamesto.site/bradbury_group_rollforming143gn.pdf
    • http://raponikidosal.getenjoyment.net/bilingual_arabic_english_books.pdf
    • http://my-favshopg.online/ansys_mechanical_tutorialzr9fv.pdf
    • http://tufofol.medianewsonline.com/annette_larkins_recipes.pdf
    • https://ratofesut.weebly.com/uploads/1/3/5/3/135304008/1674745.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bavevex.onlinewebshop.net/36989544129.pdf
    • https://ee42ee57-4547-4a8c-8a66-6cccb7f6869d.filesusr.com/ugd/2a9ad2_b9a535290fbb4601ad12e534d28b4857.pdf?index=true
    • https://a9f3490c-def6-45ea-9957-aefa341d54bd.filesusr.com/ugd/84b587_3e7b6ccf45364b6098ac566211e20aaf.pdf?index=true
    • https://8c56b32b-3398-45d6-9c0b-b55146621f16.filesusr.com/ugd/6924eb_b7f6fa38514848d3a8b49c14644d5ab3.pdf?index=true
    • http://legokejapo.atwebpages.com/how_do_i_return_to_sender_australia_post.pdf
    • https://f33d1b56-f518-462b-b61f-c1b5c1ba661c.filesusr.com/ugd/1c44ce_379bc5b3ebb64101beaac3fffcd62b60.pdf?index=true
    • https://b9eb3541-094c-4606-b101-17c2291fd6e1.filesusr.com/ugd/a18601_6756ec967d964b8f914ee8e7b2a042d7.pdf?index=true
    • http://xomutojekes.myartsonline.com/boston_t_map.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_off0000fe2e.bin
65c478f86ade9cdcf22aa60597e52cfb4c8d6988c1c3b27d4ba354f1f9b97a7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2E 5676 bytes
font_01_sfnt_off000111ae.bin
61848a2811571516e88c3528f64ddce730cfc7a2054d3f18e0eb03b0f7b1b0d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111AE 12192 bytes

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