Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a101543b68dfaef…

MALICIOUS

PDF

73.8 KB Created: 2021-03-03 01:53:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: e1adf8568f2669130cf7907f4eaaaebf SHA-1: ecdf874b8619d9533eacdc6d1363476cc08490fe SHA-256: 9a101543b68dfaef286be10b8743b3812daf3c20b373415580493c4a7ebca96e
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. The PDF contains numerous embedded URLs, many pointing to disposable domains, and one prominent URL includes 'utm_term=wilderness+first+aid+handbook+pdf' suggesting a lure to disguise malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further indicates a large number of links on disposable hosting, reinforcing the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://lozipotod.ru/strik?utm_term=wilderness+first+aid+handbook+pdf PDF link annotation
    • http://repair-telefonov.ru/nimuzuwotodikivilokanoz9xtz.pdfIn PDF document text
    • http://detonic-de.website/41599763880lfd9r.pdfIn PDF document text
    • http://tesugujinarijag.mywebcommunity.org/o_que_comer_para_no_engordar_na_menopausa.pdfIn PDF document text
    • http://baturoguvumoviz.22web.org/vefekosopozobugobuwese.pdfIn PDF document text
    • http://rolopigabetitu.scienceontheweb.net/shogun_2_total_war_units_list.pdfIn PDF document text
    • http://callipakk2.site/rocket_mass_heater_greenhouse_planst1unk.pdfIn PDF document text
    • http://solent.bar/black_desert_online_musa_gear_guidermj0h.pdfIn PDF document text
    • http://sesizuxewewax.mygamesonline.org/zapowoxebugonu.pdfIn PDF document text
    • http://tafelutij.22web.org/10147408820.pdfIn PDF document text
    • http://tufofol.medianewsonline.com/dasimafafavi.pdfIn PDF document text
    • http://air-calm2.club/vanuxaxukukixujivt16sd.pdfIn PDF document text
    • http://bopolubolef.mywebcommunity.org/57061380742.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zapopododo.rf.gd/bidewegifijasovigadiva.pdfIn PDF document text
    • https://s3.amazonaws.com/fivebo/85993309140.pdfIn PDF document text
    • http://meganabinas.rf.gd/powabenusuwawagow.pdfIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/xeniwudelufepakigesurep.pdfIn PDF document text
    • http://bufijonewufo.onlinewebshop.net/asus_router_rt-n66u_firmware.pdfIn PDF document text
    • http://genibadelanaf.epizy.com/49395004096.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C0 5348 bytes
SHA-256: 3aaec2e16b4a870ca8db8353e20a5e58ac0443d73bdb684d150e1bf35858c251
font_01_sfnt_off0000f4eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EB 11036 bytes
SHA-256: 491bf42b683e882306943a9103a50e125c3c84af08951e1e41b60ed8f55665ec

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