Malicious PDF — malware analysis report

Static analysis result for SHA-256 72bbb45fa527601b…

MALICIOUS

PDF

136.1 KB Created: 2021-03-08 02:28:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: b7c6c0e353d332d07f054d44d112661c SHA-1: b8e227cda46acc095e262149d52123833e9ec39a SHA-256: 72bbb45fa527601b1b39e88536aa7f348828e326ea0e2bbf01db25a4c5d66601
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these external links. No scripts were extracted, but the PDF structure itself is indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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 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.
  • 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://mezovuduw.ru/strik?utm_term=are+romeo+y+julieta+cigars+good PDF link annotation
    • http://manovina.mypressonline.com/is_nyu_required_sat_for_2021.pdfIn PDF document text
    • https://tumafikajenama.weebly.com/uploads/1/3/5/3/135326798/senadudapu-pakola-mabomaniga-zerenoxolu.pdfIn PDF document text
    • https://sutogibigasoju.weebly.com/uploads/1/3/1/0/131070189/7135419.pdfIn PDF document text
    • https://nasoluludeg.weebly.com/uploads/1/3/4/4/134435301/2312174.pdfIn PDF document text
    • https://fizinizaboz.weebly.com/uploads/1/3/5/3/135304720/2494924.pdfIn PDF document text
    • http://mumijivamivaxij.medianewsonline.com/manual_sigma_1609_sts.pdfIn PDF document text
    • https://zigibopujomez.weebly.com/uploads/1/3/5/3/135350997/b3f57f.pdfIn PDF document text
    • https://dofemavuxowag.weebly.com/uploads/1/3/0/7/130739836/gelagegaxulivukawe.pdfIn PDF document text
    • http://kugewezebuvigiw.mygamesonline.org/is_audacity_good_for_recording_music.pdfIn PDF document text
    • http://sugameloxufe.mywebcommunity.org/7327165774.pdfIn PDF document text
    • https://wigabededonekan.weebly.com/uploads/1/3/0/7/130740374/lipewodu.pdfIn PDF document text
    • https://wuvepudikuj.weebly.com/uploads/1/3/4/7/134731811/8cfdc9130879.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8dd6ea07-d7cc-41d3-9631-f2c4c268c2e2/how_to_change_battery_on_ipod_touch_4th_gen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a63011f-123a-42c8-85e0-4a5740784df0/solok.pdfIn PDF document text
    • http://rukosivujuxu.atwebpages.com/los_hermanos_karamazov_resumen_breve.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f0d7ca6-0176-4016-853c-d4b89693b0cc/64298213700.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e678acb-4215-4136-99df-ff1cbb479672/gufawawazazupakiladaroziw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f24fe1b-e070-40f6-b13b-5da6726c46f9/tcs_c_interview_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fef4a83-2fd3-4a91-99ec-29de0cc9af6d/where_to_donate_winter_coats_in_edmonton.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33fd01d4-9101-4b35-a812-b93e28d803db/sentry_safe_master_code.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a16b9bc-3748-4915-a3bc-05a14a5203e4/givinoxuvobave.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2e7c94d-f47a-42cd-8acb-0d7229b9847c/20738365390.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a722ada2-3408-42d4-b566-554e6465e156/nezusatafasogelurit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb5966a8-7820-48e8-b495-00e3a4950c5b/88383123257.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8814deae-0f6a-4e56-8267-0ddcd45a9fd4/echo_gt_225_replacement_head.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001c245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C245 5428 bytes
SHA-256: 8952a83ab88edd85427885cbe82bbfb824936b8862af04fc29971bdecb67e3ea
font_01_sfnt_off0001d4b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D4B0 12616 bytes
SHA-256: 64f84f1d90f07c03b7f303248b691e331b362884db677c27994b6b272f077d1e
font_02_sfnt_off0001fd33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FD33 16088 bytes
SHA-256: 03960e94341ab841137cbe6197103fffd30a7fafefedd10e64b418088fbffec0