Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b3312d95b691cd1…

MALICIOUS

PDF

72.3 KB Created: 2021-01-06 06:17:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 97a5b4d9ca174b54183beabdf07b0443 SHA-1: c7112c975b07d08920946d28a941bc2ab7faa087 SHA-256: 7b3312d95b691cd1ede894fce4d53038ac4d0ca86a2f219b69734f8930eaf991
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and appears to be junk data, but the presence of numerous links suggests an attempt to lure the user to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://traffking.ru/aws?utm_term=maroochydore+surf+cam+surf+report+coastalwatch.+com In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366041/normal_5fda8ea5351fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412607/normal_5fba5252bb0b1.pdfIn PDF document text
    • https://tusidotug.weebly.com/uploads/1/3/4/4/134482214/2633454.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382429/normal_5fa06f796eac4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381738/normal_5f8b2ed1bac81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496372/normal_5fb410649363a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409096/normal_5fb0354653d30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457560/normal_5faa4143541a6.pdfIn PDF document text
    • https://magudutetu.weebly.com/uploads/1/3/1/4/131437318/lizib-lefowafibezotaf-dixefule-xoxewifisa.pdfIn PDF document text
    • https://babikovinemixe.weebly.com/uploads/1/3/1/8/131856339/2861703.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/644b93a9-6fda-4b7a-aced-5bbbb61e50e2/21_day_fix_workout_schedule.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba6f5afb-1f7d-4a42-bc44-474e3fd3aff0/3d_home_design_online_easy_to_use_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7907b5b7-1ba4-46cc-9e6c-fa3e9c768ce1/pipitexalinaxemurivirom.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_off0000dc8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8B 5624 bytes
SHA-256: 44bd61d178f06df6663702d6018e26780de7bb714f7fffa437279e9cbf7b4ffd
font_01_sfnt_off0000efab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAB 10612 bytes
SHA-256: 6a94dd83913001e6699f3ddcfffac124574f94a633530d2a2591b7af9add165b

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