Malicious PDF — malware analysis report

Static analysis result for SHA-256 d62a0d1c317961ca…

MALICIOUS

PDF

75.8 KB Created: 2021-03-13 19:16:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5ff82ea92368f30223d717587cf0a6a6 SHA-1: 5310c3bf60d8069700ac28721ea94f68ba84246d SHA-256: d62a0d1c317961ca1f1e9da40dfec9ac80157308b6568179596bb3fb25969bbd
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated and point to potentially malicious content, as indicated by the 'PDF_SEO_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' heuristics. ClamAV also detected this as 'Pdf.Phishing.Trojan'. The embedded URLs suggest an attempt to redirect users to phishing sites or download further malicious content, aligning with a spearphishing attachment attack vector.

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://xezojetit.ru/wix?keyword=earth+science+study+guide+quizlet
    • https://cdn.sqhk.co/bamikalagov/Vijaslb/smash_bros_melee_unlockables.pdf
    • https://cdn.sqhk.co/lujobitazeku/e2jbhb0/71724013537.pdf
    • https://vifegozotamideb.weebly.com/uploads/1/3/4/2/134236473/5702846.pdf
    • https://pibigetikuke.weebly.com/uploads/1/3/5/3/135387636/lulizufepuvi_xejibujasidaxob_puwerode.pdf
    • http://mumolazesinidix.getenjoyment.net/what_is_the_difference_between_hatha_and_vinyasa_yoga.pdf
    • https://pudorexejuvaw.weebly.com/uploads/1/3/1/4/131455832/lomiko_garexagigor_nosutudav.pdf
    • https://datirelegewewat.weebly.com/uploads/1/3/4/3/134329883/a7eb43eceeb1b6b.pdf
    • http://wikotimu.scienceontheweb.net/write_a_personal_narrative_for_me.pdf
    • http://rafupofamurawaf.mygamesonline.org/25010148266.pdf
    • https://rekepepijo.weebly.com/uploads/1/3/4/0/134018016/963354e01.pdf
    • https://sisareses.weebly.com/uploads/1/3/1/4/131454440/jorunizixidixapomi.pdf
    • https://cdn.sqhk.co/winelolibug/Qbiegef/kanye_poopity_scoop_10_hours.pdf
    • https://teniroge.weebly.com/uploads/1/3/4/6/134693228/bumevivusemu_fuzof_sagosupaxit_janisiwotefuko.pdf
    • https://cdn.sqhk.co/dofofigeniso/ggcijde/fundamental_definition_english.pdf
    • https://fikosaxan.weebly.com/uploads/1/3/4/7/134753192/3383627.pdf
    • https://cdn.sqhk.co/pawexedibib/nldjdgf/pan_s_labyrinth_characters_names.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b757f17c-98a1-4c29-b8da-0b2586949c84/piroliw.pdf
    • https://s3.amazonaws.com/tedowafomaru/55299062337.pdf
    • https://uploads.strikinglycdn.com/files/585edd04-b553-4fcb-9394-69b8c65fa8f1/echo_gt-225_replacement_parts.pdf
    • http://rukosivujuxu.atwebpages.com/zuviwewupiganiporadipir.pdf
    • https://s3.amazonaws.com/setikizo/where_to_put_scout_badges_on_uniform.pdf
    • https://s3.amazonaws.com/gavobawum/motor_vehicle_accident_report_nj.pdf
    • https://s3.amazonaws.com/pizivurapab/invite_to_lunch_template.pdf
    • https://uploads.strikinglycdn.com/files/df2400f6-2023-45cb-aa51-a376168cfed0/90359606861.pdf
    • https://uploads.strikinglycdn.com/files/e5902dcd-d9ee-436e-abdf-1e84cb535011/segejizisojofagewiza.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_off0000eb41.bin
33ffe20873f36b52b1218ac6c1f3979fec6dc3c25c9d918d6a4b807168290781		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB41 5436 bytes
font_01_sfnt_off0000fdc5.bin
4e434855596b293be3093f4dc3de645b5810575a9cffc48d26468dcb68590198		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC5 10420 bytes

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