Malicious PDF — malware analysis report

Static analysis result for SHA-256 563db69daf5785bf…

MALICIOUS

PDF

79.2 KB Created: 2021-03-30 22:13:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 96e239855edcb150e579edad4290257a SHA-1: 4f017436d62c55e22fe66bea58e39c507d1b566c SHA-256: 563db69daf5785bfb29bd1f551b2ffc4a1e1fcdc14ec52f911345e667ef151ba
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The embedded URLs, such as 'https://xajibur.ru/strik?utm_term=what+is+objective+model+of+curriculum+development', are likely used to redirect users to malicious sites. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xajibur.ru/strik?utm_term=what+is+objective+model+of+curriculum+development PDF link annotation
    • https://cdn.sqhk.co/vugasoveg/UhiljbA/derailed_2005_movie_trailer.pdfIn PDF document text
    • https://cdn.sqhk.co/pefisemise/idNshi6/snake_plant_light_and_water_requirements.pdfIn PDF document text
    • https://cdn.sqhk.co/mogezunir/bYhfcZI/xapolabafufaxi.pdfIn PDF document text
    • https://cdn.sqhk.co/lutuganoda/hj3cgeX/24665210346.pdfIn PDF document text
    • https://cdn.sqhk.co/lusajiki/hewjiOs/ropobatewisezajidid.pdfIn PDF document text
    • https://mabavelege.weebly.com/uploads/1/3/0/7/130775551/8984b30d0b.pdfIn PDF document text
    • https://cdn.sqhk.co/woleparos/thjjh4n/bidegomotekul.pdfIn PDF document text
    • https://cdn.sqhk.co/vabolepibe/nhdXheo/girl_hero_costume_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/jivonaxadu/eqRidhc/vojamezuzo.pdfIn PDF document text
    • https://dofafurubes.weebly.com/uploads/1/3/4/7/134762343/sigolawovege.pdfIn PDF document text
    • https://xujuwoxevosu.weebly.com/uploads/1/3/4/8/134896670/82762a3c2f942.pdfIn PDF document text
    • https://lamonide.weebly.com/uploads/1/3/4/0/134096931/481a51065f.pdfIn PDF document text
    • https://cdn.sqhk.co/dunuxorigu/0Vqhcid/75733676383.pdfIn PDF document text
    • https://tebifuwufarul.weebly.com/uploads/1/3/4/8/134886387/sanivutuzug.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/93622444211.pdfIn PDF document text
    • https://6e37e838-c278-4d46-baa9-25b8497af200.filesusr.com/ugd/fbcb80_36f0c5eb33da4b2f8205f0cfc4cb3073.pdf?index=trueIn PDF document text
    • https://2a403a33-5f6e-4534-96f9-742aa7325afc.filesusr.com/ugd/d2da83_33a981b1944b48fe85ab1597e9fed6ec.pdf?index=trueIn PDF document text
    • https://eb72eaa1-ef55-40a3-a653-f6d21bccf295.filesusr.com/ugd/54913d_c767f8014c9b48428ec2cddf05a78a8a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/romeo_and_juliet_act_1_scene_2_stylistic_devices.pdfIn PDF document text
    • https://a581e706-3bf6-41fb-8978-ad4d4077590d.filesusr.com/ugd/afbe6b_ce743e871890445b95cabccc564bf544.pdf?index=trueIn PDF document text
    • https://0e733887-fd72-4d21-8b10-0a39cafbc931.filesusr.com/ugd/1e4d10_8663d6d290374fbe8b578b5cc55b8691.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/57a54847-3489-413f-b9bf-98176677f593/76408258460.pdfIn PDF document text
    • https://s3.amazonaws.com/jovekus/tepezuwadozokemum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95909957-40fb-4f9f-9702-7dfd1d590a61/how_much_is_a_2010_camaro_payment.pdfIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/max_raid_battle_den_guide.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_off0000f803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF803 5684 bytes
SHA-256: 298262ec9740ed8cda79396c98896d7e1f8854474dc3cf6a0017aa825ea73f70
font_01_sfnt_off00010b3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3E 10404 bytes
SHA-256: b035c775e9764c88af746ff0517519406f660f2a40469258e5029ea494ec8c7f