Malicious PDF — malware analysis report

Static analysis result for SHA-256 a29cfcb11ea2ea6c…

MALICIOUS

PDF

83.2 KB Created: 2021-04-24 02:50:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: ba5ed6c47137492dd6188adb2f6e36e4 SHA-1: 782cdfb62b0b840d5f9561bcf1d8d6f4e5991e83 SHA-256: a29cfcb11ea2ea6c18cabf0f71ae9dfe29cc0bb5a0625b045ce02b2008e2c5d1
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable hosting and known malicious redirectors, indicating a phishing or scam attempt. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to lure users to malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=central+vs+peripheral+nervous+system+symptoms In PDF document text
    • https://moforikegumiret.weebly.com/uploads/1/3/2/6/132680993/3140102.pdfIn PDF document text
    • http://thiswaytovogue.com/lg_steam_washer_and_dryer_installationzpwjw.pdfIn PDF document text
    • http://pubguckazan.com/star_wars_saga_character_sheet_fillable0wu2r.pdfIn PDF document text
    • https://juwaxevepatasi.weebly.com/uploads/1/3/0/8/130874094/959cbbd32f46e.pdfIn PDF document text
    • https://mafekesajivirik.weebly.com/uploads/1/3/4/3/134381466/pufesojovudip.pdfIn PDF document text
    • https://voledobaseju.weebly.com/uploads/1/3/0/9/130969813/wereso-kixusagex.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403271/normal_5fc6dcc897526.pdfIn PDF document text
    • http://nebo-baikala.ru/ti_30xa_calculator_onlinehpfa3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417032/normal_60426f7c7c46a.pdfIn PDF document text
    • https://mututekabifu.weebly.com/uploads/1/3/4/4/134466573/0e0c3681a05a.pdfIn PDF document text
    • https://lopomibuliwipa.weebly.com/uploads/1/3/1/3/131381919/kapurakerivener.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498324/normal_605c9822d93c0.pdfIn PDF document text
    • https://tibaxasunoz.weebly.com/uploads/1/3/4/5/134589804/a2c3d4a27.pdfIn PDF document text
    • http://3-bureaureport.info/687397739607q8e1.pdfIn PDF document text
    • http://quickpapp.online/8475799121rp5fq.pdfIn PDF document text
    • http://trelon.fun/nulefujuxel8sv8.pdfIn PDF document text
    • http://storeeu.info/bozokbw7os.pdfIn PDF document text
    • http://erogan-columbia.site/97676269499d6ckf.pdfIn PDF document text
    • https://kizuzeno.weebly.com/uploads/1/3/5/3/135326612/damejon.pdfIn PDF document text
    • http://martakkord.ru/the_monkeys_paw_middle_schooljlvsz.pdfIn PDF document text
    • http://eslivdrug.space/skin_in_the_game_taleb_epub_downloadb8idr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1febf520-1181-4501-a3b9-ef8683105a53/how_to_bypass_ge_washing_machine_lid_switch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/beb29561-33a1-4964-8d5f-c6532d6b486e/77137026170.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65224cf8-fa65-4a33-9750-d6726dd3b2c7/greetings_in_arabic_to_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f93a53c-31e2-4202-bf85-6dacdf9fafd6/medabevatarikuzo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a98f248-5574-4cdd-a242-4dc2fe2f4ecb/how_to_read_financials_for_stocks.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_off00010961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10961 5128 bytes
SHA-256: f76d98f5411ca5446df5f47fb313830ecb1387b00518854a781c02bf131adf5b
font_01_sfnt_off00011aae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAE 10424 bytes
SHA-256: d14bc3f6ec1a30b3edf9e3427cde0c14cacbbf7790163b35f0ef8dcde9e3dd7d