Malicious PDF — malware analysis report

Static analysis result for SHA-256 42816e26f80e606e…

MALICIOUS

PDF

72.5 KB Created: 2021-02-12 02:48:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: cddd6883cb58464471538ad2f3297cb1 SHA-1: 6fab810414f0b2e78b3c94496d4f8bc403119f8d SHA-256: 42816e26f80e606e88c606536d73bf00c23bfb74316b844638c4b2580e3064b8
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links pointing to external PDF files, many hosted on disposable domains. One critical heuristic indicates a link to known malicious redirector infrastructure, and another identifies it as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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/wix?keyword=algebra+2+book+mcgraw+hill In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367299/normal_601e415fc95a9.pdfIn PDF document text
    • http://ritual-venki.online/business_continuity_plan_template_for_financial_servicesy19lo.pdfIn PDF document text
    • http://reduslimitalia-official.website/panda_docs_workflow3xucm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366041/normal_5fea2556d43c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402956/normal_5fd619f3a8373.pdfIn PDF document text
    • http://help-violation.com/jio_prime_membership_recharge_for_jio_phone467zr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388617/normal_5fdab9b90432a.pdfIn PDF document text
    • https://nufewaxitobazat.weebly.com/uploads/1/3/4/7/134748461/fibezowosoluf.pdfIn PDF document text
    • http://jumazuke.iblogger.org/alphanumeric_keypad_android_phone.pdfIn PDF document text
    • http://harmony-market.ru/how_to_download_minecraft_maps_on_psmqevf.pdfIn PDF document text
    • https://zesujixiti.weebly.com/uploads/1/3/1/3/131398447/mimawe.pdfIn PDF document text
    • https://zodoxofavuzawa.weebly.com/uploads/1/3/1/4/131437464/425afa4c.pdfIn PDF document text
    • http://pet-guru.shop/amazon_prime_music_unlimited_family_cost_uk5rkjb.pdfIn PDF document text
    • https://noperutepa.weebly.com/uploads/1/3/4/7/134721309/pivuja_jubeferek.pdfIn PDF document text
    • http://calipshatngaccs1.xyz/70006861914sxnev.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495039/normal_600933fce485c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sumoguvovubipil.epizy.com/wifi_analyzer_app.pdfIn PDF document text
    • http://wavubodalut.epizy.com/77963678249.pdfIn PDF document text
    • http://zegubexov.epizy.com/77021683969.pdfIn PDF document text
    • http://tefinavi.epizy.com/5544674076.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_off0000de7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7B 5452 bytes
SHA-256: 0763d8ed3454ff43d5ff5f2a9667c0654b5902c1aea770d71360ee1e0c64f345
font_01_sfnt_off0000f0f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F2 10504 bytes
SHA-256: 88a4db80f1e1638ea08c132b263a3bc4fcca37b7858fecb5292575158a506c23

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