Malicious PDF — malware analysis report

Static analysis result for SHA-256 f81dededfd2a6114…

MALICIOUS

PDF

71.2 KB Created: 2021-02-12 22:57:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: b33479b60c00bc31a55358441aa75eda SHA-1: 61584cc3227ea27f12fafc99d48050ef97d66b1f SHA-256: f81dededfd2a611481d6b7edb70a6bdae7f3ea50a7d1abb5c591404adb75543a
194 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to distribute malware or phish users. The presence of a URL related to 'update instagram plus apk' indicates a lure to download potentially unwanted or malicious software. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wb?keyword=update%20instagram%20plus%20apk PDF link annotation
    • https://femesavez.weebly.com/uploads/1/3/1/3/131383434/5785294.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450151/normal_5fe6f908e0512.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377909/normal_601e8e7b88eb4.pdfIn PDF document text
    • https://pigikitukapu.weebly.com/uploads/1/3/4/6/134693564/580cdea541.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465402/normal_601fd42b8d252.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454054/normal_601de28d8a153.pdfIn PDF document text
    • http://1cats.space/blank_calendar_jan_2019_templated2m01.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409000/normal_5fc7ada28e911.pdfIn PDF document text
    • https://kanelepamub.weebly.com/uploads/1/3/4/1/134132184/6005265.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421330/normal_600c81637cddb.pdfIn PDF document text
    • https://borobufa.weebly.com/uploads/1/3/1/4/131406827/1035119.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453344/normal_5fe7848327719.pdfIn PDF document text
    • https://lututigit.weebly.com/uploads/1/3/5/3/135335707/pijiwikag-xadesemu.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/xefejevife/foxosojo.pdfIn PDF document text
    • https://s3.amazonaws.com/jaloto/father_s_day_tie_card_template_free.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_off0000da63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA63 5332 bytes
SHA-256: 4fd33ba92abd05664e53b6901780778147ba3ef4c2812d2c8d190e59686cb226
font_01_sfnt_off0000ec71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC71 10544 bytes
SHA-256: ec8db250f0193a9c5c9e092fb8d93ef1e0cae30d05b262d24e1545f469382c00

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