Malicious PDF — malware analysis report

Static analysis result for SHA-256 a20100640e41f384…

MALICIOUS

PDF

73.2 KB Created: 2021-02-16 09:46:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 016430465cd38c700b4e949f60996dc0 SHA-1: cec9b08322a8db3abfad753ca369ab01f9a63aea SHA-256: a20100640e41f384dae5def4d5e5002950cb0716ddb57ab1cb80a9d4de2bff33
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. The primary URL, 'https://baarspo.ru/wix?keyword=sustainability+worksheet+australia', suggests a lure to a website that may host malicious content or phishing pages. While no scripts were directly extracted, the PDF structure and extensive external linking are indicative of a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://baarspo.ru/wix?keyword=sustainability+worksheet+australia PDF link annotation
    • https://milavunaxowe.weebly.com/uploads/1/3/4/7/134717052/5609749.pdfIn PDF document text
    • https://cdn.sqhk.co/xenivoronizu/gfhtpJX/outside_house_painters_near_me.pdfIn PDF document text
    • https://wewiloviwa.weebly.com/uploads/1/3/4/5/134585183/ritadom_soxofubavovober.pdfIn PDF document text
    • https://cdn.sqhk.co/sixitigoxeto/mgjIwgj/62251374125.pdfIn PDF document text
    • https://visopitolunew.weebly.com/uploads/1/3/1/4/131483219/latopodozote.pdfIn PDF document text
    • https://cdn.sqhk.co/raserijene/iihggdR/80855769612.pdfIn PDF document text
    • http://micrometerdigital.xyz/benzyl_chloroformate_50_in_toluene_density3r1ya.pdfIn PDF document text
    • http://atlas-copco.su/nanup2vmg4.pdfIn PDF document text
    • https://cdn.sqhk.co/mikedeto/jibw3DN/playgo_gourmet_kitchen_appliances_sam_s_club.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/nakuzafol/fabric_softener_sheets_insect_repellent.pdfIn PDF document text
    • https://s3.amazonaws.com/sogovekevi/silixiruwiremos.pdfIn PDF document text
    • https://s3.amazonaws.com/xixonu/atp_2020_calendar.pdfIn PDF document text
    • https://s3.amazonaws.com/wulagisi/zifesotajul.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD537 5156 bytes
SHA-256: 234a873dad1e6fccf0746f4c0d19f5a590302822c5811d242abc73dcb446c36a
font_01_sfnt_off0000e6bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BD 10192 bytes
SHA-256: 439d6453370fa9f3e84432e392a783af0d7520118abaee14db3cb0b7b9261491
font_02_sfnt_off0001099f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099F 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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