Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc8f9ae1903c8042…

MALICIOUS

PDF

83.9 KB Created: 2021-03-20 02:24:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd3b4715fd4eccc5893f50115612206e SHA-1: 9928735263839ed652494087ab28b544a841c4f5 SHA-256: fc8f9ae1903c804280842a114137fe46be1d5ed35307ab9aa8e41ccdc3292499
156 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a link farm, indicating it is designed to host numerous external links. One of these links, 'https://pelibifir.ru/123?utm_term=vlookup+example+between+two+spreadsheets', is presented in the document body and is likely malicious. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://pelibifir.ru/123?utm_term=vlookup+example+between+two+spreadsheets
    • https://cdn.sqhk.co/podogule/h6ihjiu/86611055760.pdf
    • http://kersita.space/49694444075bokxn.pdf
    • https://cdn-cms.f-static.net/uploads/4445337/normal_60365f2584cbb.pdf
    • https://cdn.sqhk.co/vipujitebiki/TgfV2rH/samemijolenudavo.pdf
    • http://losinglotterynumbers.com/memegi1ia0.pdf
    • https://static.s123-cdn-static.com/uploads/4423189/normal_60048ceb5620a.pdf
    • http://balifruit.com/95609055220njm5a.pdf
    • https://cdn-cms.f-static.net/uploads/4499023/normal_600d6a799059b.pdf
    • http://bred-enligne.com/vujefijojumusezaforojinh4ox.pdf
    • https://cdn.sqhk.co/tinulafi/fWhext8/blaze_monster_truck_cake_pan.pdf
    • https://cdn.sqhk.co/kozutani/ii23ijP/dovupotipekukunafo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/768a210b-2f1e-4f7c-ad85-d64ad1c29aaf/orbit_irrigation_timer_nz.pdf
    • https://uploads.strikinglycdn.com/files/2379ff8e-c89a-4dce-bfe4-93d9903d94f9/what_is_a_good_mathematical_proof.pdf
    • https://uploads.strikinglycdn.com/files/4f6e3fd3-014b-4257-bd3b-246fb0cb79b7/dell_optiplex_gx620_datasheet.pdf
    • https://fa53e508-d88d-41cb-897c-7a5b6f1bfcc3.filesusr.com/ugd/361045_ed4c373d8e934e0abc9bc7bd91d11ded.pdf?index=true
    • https://03df18d0-0a94-4077-8b44-1f3cf8b7c870.filesusr.com/ugd/23a6c3_203851f4d7de49f28eda586d685ed11d.pdf?index=true
    • https://05b56818-8b0b-4484-a411-4f1234233f1c.filesusr.com/ugd/e49726_ccf92e7400f948e499a91e8bff79221c.pdf?index=true
    • https://45ae50e1-98a8-4501-9ad6-fc0df438eb43.filesusr.com/ugd/b16523_4a08a1ead14c4baf9f375a905c2534b4.pdf?index=true
    • https://uploads.strikinglycdn.com/files/49a87f56-a28d-4a35-9aa6-646bf443a275/ps4_headphones_not_detected.pdf
    • https://uploads.strikinglycdn.com/files/d75cd1fb-0bad-4c6a-8d36-8fd69b9575a3/huffy_cruiser_bike_walmart_24.pdf
    • https://35548484-ce42-4b18-9d9d-834326683263.filesusr.com/ugd/a221b6_01a519daef034471ac5e97a9a4a509ce.pdf?index=true
    • https://6f672a44-e16c-4921-a0f1-e3781c0647c5.filesusr.com/ugd/bda22a_f6e7e0b1480c4d5e85357c9acc89b3c2.pdf?index=true
    • https://204833c8-abda-4421-8777-5048ee7dd919.filesusr.com/ugd/e30b7a_3bf434b5bb984792a09d5cdb42ccadc0.pdf?index=true
    • https://a9f3490c-def6-45ea-9957-aefa341d54bd.filesusr.com/ugd/84b587_5d2e0e7d81564902b7052a8f33108ef6.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc03.bin
d90b6ed1d8974cb9d62f5552c251a7bb824e92d82623c7c5f5e229bd72cb67cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC03 5364 bytes
font_01_sfnt_off00010e18.bin
18fd1c9c87d96c39475fd35c074ba483b1ae06a869649be5d92bc2414729bf3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E18 11016 bytes
font_02_sfnt_off000133d1.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x133D1 4324 bytes

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