Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d81cffac004d093…

MALICIOUS

PDF

82.6 KB Created: 2021-04-19 23:41:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 47f079e07086f30556bad5cab8dc412a SHA-1: ccf55e814cc59b649f46210343388f49b93efdf3 SHA-256: 7d81cffac004d09339a2878486257d3ec8ff8e6bc0711fc03bacbcae1b996e94
186 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics as a link farm and by ClamAV as a phishing trojan. It contains numerous external links, including one to 'https://gimoguvi.ru/strik?utm_term=sat+math+1+tips+and+tricks', which is likely part of a phishing or scam campaign. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://gimoguvi.ru/strik?utm_term=sat+math+1+tips+and+tricks PDF link annotation
    • https://wifiluguzuz.weebly.com/uploads/1/3/1/4/131437957/a570ea5dbd8e31.pdfIn PDF document text
    • http://bujufamamaw.22web.org/niwupifaxelukaketoderu.pdfIn PDF document text
    • https://faluwesidiji.weebly.com/uploads/1/3/0/7/130738597/3122384.pdfIn PDF document text
    • http://jijipefifi.iblogger.org/adobe_reader_dc_edit_free.pdfIn PDF document text
    • https://cdn.sqhk.co/xibetevoxaj/bAijhb0/ancient_greece_bronze_age_timeline.pdfIn PDF document text
    • https://cdn.sqhk.co/gimanoretev/rheheji/nedijudunibiwefonajuje.pdfIn PDF document text
    • http://gozenozidejon.22web.org/88573527145.pdfIn PDF document text
    • https://zusadadej.weebly.com/uploads/1/3/4/8/134856209/fadd621bfd2358.pdfIn PDF document text
    • https://cdn.sqhk.co/noloxunipe/hMjaszk/97256576573.pdfIn PDF document text
    • https://dubebonu.weebly.com/uploads/1/3/0/8/130874554/gojapadudafifu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f3ea461b-95fd-44cf-949c-5afda193840f.filesusr.com/ugd/a48928_4c67ce706e6d470dbb1491eededc22b6.pdf?index=trueIn PDF document text
    • http://zazozipuse.rf.gd/rufuj.pdfIn PDF document text
    • http://xalesikejuxo.epizy.com/super_brick_breaker_game_free.pdfIn PDF document text
    • https://70848fb0-0fd0-490a-9360-2ffa38fc212c.filesusr.com/ugd/08e331_f1c49000872f41338b32f46857ef9c3e.pdf?index=trueIn PDF document text
    • http://xuzujokavagud.epizy.com/generate_barcode417.pdfIn PDF document text
    • http://wotalagaxidi.rf.gd/incident_report_template_australia.pdfIn PDF document text
    • http://bisobegavur.epizy.com/4270549871.pdfIn PDF document text
    • http://zewomasajeguzud.epizy.com/foxuxijixisara.pdfIn PDF document text
    • https://d21da297-2d1c-4020-882f-059d99c29dc9.filesusr.com/ugd/3724a2_03979682a639433d94c1d01d1742bf45.pdf?index=trueIn PDF document text
    • http://medinipedulete.epizy.com/lijixojibepad.pdfIn PDF document text
    • https://13a2bf7a-7930-4518-a7e6-737bf3c0aa4f.filesusr.com/ugd/f5c1a0_fb1fd62a7bb043d9ba40d213f86eb893.pdf?index=trueIn PDF document text
    • https://368051e9-4199-40ea-b9a2-dc6e6f83cb3b.filesusr.com/ugd/6260fe_431374644b9845918f55eb55800fa509.pdf?index=trueIn PDF document text
    • https://19508648-7f28-415f-8121-b57715dc1465.filesusr.com/ugd/9734e7_ce15c5fbda934c68b90a9fe242651b3d.pdf?index=trueIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F9 5500 bytes
SHA-256: 9eee1191f169c8398b1a8e2866c8f43d4157a1b5125c348594444b458705f595
font_01_sfnt_off00011786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11786 10988 bytes
SHA-256: 1f07c4ed961d79c36d95703488d6a52d888a77ff6a757b6c41830cfbfd5d1a4d