Malicious PDF — malware analysis report

Static analysis result for SHA-256 1890acf425badd02…

MALICIOUS

PDF

83.3 KB Created: 2021-05-18 19:01:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 730a8560db218ca7abbfd668df49fb2e SHA-1: 5353842238f2e83fcab36dde1543bdb6b81bbd94 SHA-256: 1890acf425badd02a273028db3a89c66bf3a6be8bf67ce2bf8f2c5a7ebfd8712
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution vector, likely leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://botokaw.ru/strik?utm_term=avtech+4ch+mpeg+4+dvr+manual PDF link annotation
    • https://norudajesopoz.weebly.com/uploads/1/3/4/3/134340776/xegudim.pdfIn PDF document text
    • https://fanizoliboligom.weebly.com/uploads/1/3/1/0/131070566/61bf32.pdfIn PDF document text
    • https://duwizule.weebly.com/uploads/1/3/4/6/134663296/2443025.pdfIn PDF document text
    • https://beretukajawedu.weebly.com/uploads/1/3/4/7/134713042/6198029.pdfIn PDF document text
    • https://lokamafurixese.weebly.com/uploads/1/3/4/5/134509290/resipapotugajap_goxuzutakafijen_mudepugufono_sulolezeb.pdfIn PDF document text
    • https://widetidutu.weebly.com/uploads/1/3/1/4/131453832/gamej.pdfIn PDF document text
    • https://wavopotajulaja.weebly.com/uploads/1/3/4/6/134631105/553e5.pdfIn PDF document text
    • http://viwivomoxori.22web.org/air_force_model_question_paper_with_answers.pdfIn PDF document text
    • https://burufazifefep.weebly.com/uploads/1/3/4/5/134584298/wikije_teduzoforetamod.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://votitagupen.epizy.com/89851155404.pdfIn PDF document text
    • http://fefadipif.rf.gd/lake_tahoe_tourist_map.pdfIn PDF document text
    • http://mobotifiriw.epizy.com/antony_and_cleopatra_william_shakespeare.pdfIn PDF document text
    • http://daxipazomodej.epizy.com/cascada_de_coagulacion_nueva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/131705f5-ff3c-4402-8b16-0d426e1755d9/nys_cdl_road_test.pdfIn PDF document text
    • https://s3.amazonaws.com/vobuturinivi/what_are_forex_strategies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b46ed8c-1447-4c16-8b87-f50bc16337d9/kurowalojumolujijuli.pdfIn PDF document text
    • http://tetexamafikej.epizy.com/renorixovekosidusideko.pdfIn PDF document text
    • https://s3.amazonaws.com/rorives/ark_survival_evolved_xbox_one_mods.pdfIn PDF document text
    • http://gupexofuvesok.epizy.com/84351133934.pdfIn PDF document text
    • http://donaweraketo.rf.gd/what_is_bitcoin_on_cash_app_mean.pdfIn PDF document text
    • http://xubudexev.epizy.com/shropshire_inquest_reports.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_off0000f16b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16B 5444 bytes
SHA-256: e081556cb134a2f5d4ccd24ad631d6b85c83528d28418edd9546fdfbc5714557
font_01_sfnt_off000103d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D2 10908 bytes
SHA-256: 3c444dec82b8613777bff735e3c7dbe485ca5a6589c13c37483b05a5c5c04dc7
font_02_sfnt_off0001291c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1291C 16060 bytes
SHA-256: 4c0a3f0893f5e69c6acf0c6b7f036872587aec6188c41bdd40a009ab43c82216