Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0a1368b0e53b071…

MALICIOUS

PDF

140.9 KB Created: 2021-02-15 06:17:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 64fc327c47398f267a7c396b876917de SHA-1: 5c1fb630692240ba5f702a40341ddb4b7004d3d1 SHA-256: b0a1368b0e53b0717d5b27c1596e768d7d4498de63ed1bcc34235b20c32e113f
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, indicative of a link farm. The presence of a ML classifier flagging it as malicious and ClamAV detecting it as 'Pdf.Phishing.Trojan' further supports malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest it's designed to redirect users to potentially malicious sites or host further exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://baarspo.ru/aws?utm_term=biografia+de+augusto+polo+campos+pdf PDF link annotation
    • http://sutiwejepeb.22web.org/kufegovezafobiw.pdfIn PDF document text
    • https://xazebuwojij.weebly.com/uploads/1/3/4/4/134467588/sawobososatifuleza.pdfIn PDF document text
    • http://sidanixom.22web.org/adda_247_apk_free.pdfIn PDF document text
    • https://welirupew.weebly.com/uploads/1/3/4/6/134662060/kiwujiluxesi.pdfIn PDF document text
    • https://duzejuwilana.weebly.com/uploads/1/3/4/8/134879611/bc7d4f14974d4.pdfIn PDF document text
    • https://wevuviwujito.weebly.com/uploads/1/3/1/6/131636984/leduluvup.pdfIn PDF document text
    • https://cdn.sqhk.co/tivinarafuvu/FidyxMf/92239234273.pdfIn PDF document text
    • https://duludogom.weebly.com/uploads/1/3/4/6/134673238/03d2d9.pdfIn PDF document text
    • https://sanegirorasatu.weebly.com/uploads/1/3/5/4/135400744/fubipotudupage.pdfIn PDF document text
    • https://lilonukile.weebly.com/uploads/1/3/4/7/134767916/bejisevebunof.pdfIn PDF document text
    • https://vifaseberafu.weebly.com/uploads/1/3/0/9/130969816/femut_maduwatim_gumewexixabeja_zaxarupuja.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
    • http://jonemif.epizy.com/forenugejij.pdfIn PDF document text
    • http://pufupivati.epizy.com/11695330180.pdfIn PDF document text
    • http://puvepedep.epizy.com/70353877251.pdfIn PDF document text
    • http://rowabereduxafu.epizy.com/hitman_3_blood_money_game_free.pdfIn PDF document text
    • http://varepekolati.rf.gd/fapapisiwidobodopibenomu.pdfIn PDF document text
    • http://zuxekesimulir.epizy.com/battery_percentage_pro_apk.pdfIn PDF document text
    • http://pimuxexud.epizy.com/firezi.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_off0001dd57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DD57 5300 bytes
SHA-256: bddfca203cc8d871a3fea429c097c9419b6690be04092d53e1905b9ba10ac2b9
font_01_sfnt_off0001ef64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EF64 11744 bytes
SHA-256: 579336843865086ce2774da78f7004648a7a2b2ed1bcb035c7ae45f3cd4bb906
font_02_sfnt_off000215c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x215C2 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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