Malicious PDF — malware analysis report

Static analysis result for SHA-256 867801a3185cba5a…

MALICIOUS

PDF

77.3 KB Created: 2021-03-07 19:14:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 36b6b80f247fd59a7d1c1ee73c372857 SHA-1: 52cc879b817c2be8d36072add14a86ddfb904b9a SHA-256: 867801a3185cba5a5cdf9288d26d242f39aee8aa0ae1ea69376b1d4e33553ba6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier, indicating a high likelihood of malicious intent. The primary finding is the presence of a large number of external links, many pointing to PDF files hosted on various domains, suggesting a link farm or a distribution mechanism for further malicious content. The document body is heavily obfuscated and contains metadata related to its creation, but no clear user-facing text was extracted.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • 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://golowaki.ru/123?utm_term=how+does+a+mr+coffee+espresso+machine+work PDF link annotation
    • https://povizizumor.weebly.com/uploads/1/3/4/6/134636509/b8c602f845.pdfIn PDF document text
    • https://nuxofenaf.weebly.com/uploads/1/3/5/3/135306259/vawejulowu_tupazowi_sibarowaxewid.pdfIn PDF document text
    • https://basitonivi.weebly.com/uploads/1/3/4/5/134584834/xixetanej.pdfIn PDF document text
    • https://kenuzoba.weebly.com/uploads/1/3/4/0/134017938/xikis.pdfIn PDF document text
    • https://makumanufomogo.weebly.com/uploads/1/3/0/8/130874647/bbeb29.pdfIn PDF document text
    • http://qrettalq.online/61018581901dt42n.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449627/normal_5fcb5a9d59cb9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371258/normal_6000568e7db77.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413975/normal_60250a3c30c59.pdfIn PDF document text
    • https://zegosonov.weebly.com/uploads/1/3/4/1/134109065/8cb2d109.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455658/normal_5fea23fa937df.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459483/normal_5fde1c8f8acc8.pdfIn PDF document text
    • http://alania365.ru/52681741917warz7.pdfIn PDF document text
    • http://csxmoney.info/dobidakujodazofr7nn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455375/normal_5ffb867266491.pdfIn PDF document text
    • http://sexesex.site/46127723599bpojb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371013/normal_6005dfa34aff4.pdfIn PDF document text
    • https://kanogerigan.weebly.com/uploads/1/3/4/6/134657300/zotudaxam.pdfIn PDF document text
    • http://prostosite.site/toyota_kluger_rear_seat_entertainment_system2mzkj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414871/normal_5fcc8d380871a.pdfIn PDF document text
    • https://direfuxapiw.weebly.com/uploads/1/3/4/3/134371974/d0fb6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450430/normal_5feda7137d5ab.pdfIn PDF document text
    • http://gsmall.space/best_offline_iphone_games_for_road_tripslkxhl.pdfIn PDF document text
    • http://uchebnoe.website/farmville_2_country_escape_event_guide_2020uvqry.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_off0000f0de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DE 5480 bytes
SHA-256: 5c7c161cb40984b690c43f61c7e2f8395379e59e179328c344d7196c0ea7c821
font_01_sfnt_off00010368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10368 10864 bytes
SHA-256: 1d68393d464944b65ca1aba2195e6912755c84af04c33c76f154563de9eda5e0

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