Malicious PDF — malware analysis report

Static analysis result for SHA-256 64e6d471d2619f5c…

MALICIOUS

PDF

75.9 KB Created: 2021-05-17 09:21:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9badee4d6934f34a7892be1a3598517 SHA-1: 2344e28fd7daa23462e951080e8d4abf9c095447 SHA-256: 64e6d471d2619f5cc1c98317f806edee2c56c2b5eac57654d2052e0fda170508
126 Risk Score

Malware Insights

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

The sample is a PDF document that was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document body is heavily obfuscated, but the presence of numerous external URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggest a link farm or phishing attempt. The primary attack vector is likely exploitation of a PDF vulnerability to execute a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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://cdn-cms.f-static.net/uploads/4494681/normal_60288caf53400.pdf
    • https://cdn.sqhk.co/perigupa/niahfic/knives_out_review_common_sense_media.pdf
    • https://cdn-cms.f-static.net/uploads/4464851/normal_604491617c6a7.pdf
    • https://cdn.sqhk.co/fosuzonarefi/6LOieGw/76660656252.pdf
    • https://cdn.sqhk.co/muwitajo/67hdqdC/motorola_one_smartphone_android_one.pdf
    • http://zaxevef.getenjoyment.net/35415216209.pdf
    • http://serovakarara.mygamesonline.org/gipogevijekunaxoze.pdf
    • https://cdn-cms.f-static.net/uploads/4427781/normal_6061b8abd77d0.pdf
    • https://static.s123-cdn-static.com/uploads/4488570/normal_5fc853da642fa.pdf
    • https://cdn-cms.f-static.net/uploads/4447089/normal_5fd1008263aab.pdf
    • http://tujijamutibe.sportsontheweb.net/12th_bio_botany_practical_manual_english_medium.pdf
    • http://kulanefimolon.mypressonline.com/jotigu.pdf
    • https://cdn.sqhk.co/bepesewutu/djaahQw/swordman_reforged_hack.pdf
    • http://worameruvejaka.mywebcommunity.org/nuzesenazafagoza.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://feedproxy.google.com/~r/wb/ENAH/~3/Xr6F2PkPTcg/wb?keyword=polk%20audio%20powered%20subwoofer%20psw110%20manual
    • https://c46c713f-5e69-4c64-aad4-d86f29440f76.filesusr.com/ugd/957c7b_9c6ce39a98774073a1658c423b64dbda.pdf?index=true
    • https://s3.amazonaws.com/zizene/mowotakidesibesikivow.pdf
    • https://8d684a1e-4078-49cd-b336-05adf09473b6.filesusr.com/ugd/2b25e8_aefbf8e0405e47889b5ec6fb91dc7cee.pdf?index=true
    • https://s3.amazonaws.com/resisuna/dowep.pdf
    • https://s3.amazonaws.com/gimisorixosu/46128374507.pdf
    • http://xazopufegi.onlinewebshop.net/adages_erasmus.pdf
    • https://s3.amazonaws.com/jixeremipet/hepatitis_b_testing_guidelines.pdf
    • https://27a83426-c768-4525-a63d-b5b732cca755.filesusr.com/ugd/28b3f7_db835219926545dd8eb3b2bb99c0bd5a.pdf?index=true
    • http://saluwagasa.onlinewebshop.net/508624305.pdf
    • https://s3.amazonaws.com/livivuvuwugeb/girobifija.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_off0000e444.bin
826083f23d3b01b871163c5d263daaeb8f7d627e5cc29561bfed4adb881c36a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE444 5676 bytes
font_01_sfnt_off0000f79b.bin
04065dce906d54e2d42648c5573ac10563d9942b666767920e1e2391359ca0fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF79B 12800 bytes

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