Malicious PDF — malware analysis report

Static analysis result for SHA-256 8abd397a564e4a15…

MALICIOUS

PDF

73.9 KB Created: 2020-12-21 02:40:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: b414d8c140020000f259fbcbeec8f8e7 SHA-1: dc5ec5a27280632fe98ea27fa15f47a660cd2401 SHA-256: 8abd397a564e4a15eb362fb5230f27c38cfffbcd3445017ab83b5b0a07a9cac5
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a malicious link disguised as "Virus protection for apple computers" that redirects to known malicious infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the malformed stream length and link farm heuristics suggest an exploit attempt.

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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://ggtraff.ru/strik?utm_term=virus+protection+for+apple+computers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4375356/normal_5f9e9297a8280.pdfIn PDF document text
    • https://dufevirefat.weebly.com/uploads/1/3/1/4/131438490/mofuxitifopoma-sogebu-ruwevekel.pdfIn PDF document text
    • https://papuxivosep.weebly.com/uploads/1/3/4/4/134491017/fesajoganideb.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/dolopitubolagu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492272/normal_5fdeb6190497e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470020/normal_5fc184ea32ebc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366032/normal_5f89639a289a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383452/normal_5f95a760c8c19.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jiwisi/dknight_magicbox_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9815a9a-a8d2-4c1e-87c7-e9d2d7364d5f/mepowixaba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bcfefed-aea8-4256-9873-d4c520e5e43a/98440959715.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9def3037-596c-41e4-8489-966fd8273331/josh_games_stick_rpg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fba856c-160a-43ba-a993-c8088d548b55/36980801019.pdfIn PDF document text
    • https://s3.amazonaws.com/lovomijelun/12000437590.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fcf5721deaf7179bbd14c46/t/5fd6c43e481cfa31add6b587/1607910464305/15216298747.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc36737bdb33045eed226b2/t/5fc54b9a3c02f22b9dbaff6d/1606765467204/lajomusufuretiwetafu.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_off0000e379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE379 5128 bytes
SHA-256: 59f2abb1a45d4c8153aeb68190699919dc7d00763f830fc22c57e54271b2608b
font_01_sfnt_off0000f4dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DD 10996 bytes
SHA-256: 789ead22daf1ab0d1c4de7ef17419453e1382949aade071568c2cb769567ffb6

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