Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae627791e572336e…

MALICIOUS

PDF

70.8 KB Created: 2021-02-13 18:40:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: a0586f0aaa85968c8ac7a574b6d5a5e2 SHA-1: 38cee0c77707b1240aefa84cd32c0c1e105a3d63 SHA-256: ae627791e572336eb710dca6b1e93c7555d59070e12ea808fe1e9024ae70fe48
226 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm with numerous external URLs. The document's structure and embedded links suggest an attempt to manipulate search engine results or distribute further malicious content, potentially disguised as legitimate documents. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates a common tactic to bypass gateway scanning by encrypting payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/wb?keyword=boost%20audio%20android PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374704/normal_60150dc281cd6.pdfIn PDF document text
    • https://suwisabinupa.weebly.com/uploads/1/3/5/3/135351097/5067143.pdfIn PDF document text
    • http://copyrightprivacy.site/komifen69znr.pdfIn PDF document text
    • https://bugajujifupub.weebly.com/uploads/1/3/4/8/134894919/weten_patebesolixabu_wogux_memawanujutibod.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465390/normal_5fe56da839bb7.pdfIn PDF document text
    • https://vugalemudapitos.weebly.com/uploads/1/3/1/1/131164275/5659057.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491969/normal_5ff0b48e6c522.pdfIn PDF document text
    • https://famonusowofem.weebly.com/uploads/1/3/4/3/134349488/libefigemow-lomemar-vedona.pdfIn PDF document text
    • https://wopadutizibum.weebly.com/uploads/1/3/4/3/134306931/jujavuludela.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387420/normal_5fd340d291645.pdfIn PDF document text
    • http://goproonly.com/estrategias_de_enseanza_aprendizajeguk1e.pdfIn PDF document text
    • https://rikelakejif.weebly.com/uploads/1/3/4/8/134885243/5237418.pdfIn PDF document text
    • https://mumojugaweweran.weebly.com/uploads/1/3/1/0/131070520/a9168adab4e2a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445868/normal_5fd68bb6bd271.pdfIn PDF document text
    • http://tikovg.xyz/soxawgchik.pdfIn PDF document text
    • http://hugertely.xyz/treating_blood_stains_on_sheetsdt0r2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459935/normal_5fd3cc737c0fc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482618/normal_5fcaf43c42f11.pdfIn PDF document text
    • https://forupiwiwipugo.weebly.com/uploads/1/3/5/3/135349306/6300796.pdfIn PDF document text
    • http://quickpapp.online/georgia_guidestones_contains_depopulation_messageifjj3.pdfIn PDF document text
    • http://winoraama.fun/79889635872nm9t9.pdfIn PDF document text
    • https://sugelama.weebly.com/uploads/1/3/4/8/134898925/tefufopiruse.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d96c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96C 4836 bytes
SHA-256: 4430634c6953f3d8ca8e4b5383aecc94295d8fe89862e3169172e7aadefe6a42
font_01_sfnt_off0000e9e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E9 10724 bytes
SHA-256: 07e629a4748685f25d51238aa6a149d19c8b39990a87e438457674e4f782bd1b