Malicious PDF — malware analysis report

Static analysis result for SHA-256 5efe88e40e51012f…

MALICIOUS

PDF

75.9 KB Created: 2020-11-09 18:40:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: cdb75e5ed6c95dc7ccca0334c46b0380 SHA-1: bb9abe0301e5cb982c543527fbde7857ee49e277 SHA-256: 5efe88e40e51012f0bccacf6bb36320d3bc289ecf977e0ccb37590471ed14050
222 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure and a PDF link farm. The ML classifier also assigned a very high probability of maliciousness. The document body, though heavily obfuscated, contains text related to 'Swann security systems manual 1080', suggesting a lure to disguise the malicious links. The presence of numerous embedded URLs, many pointing to external PDF files, indicates a likely attempt to distribute further malicious content or engage in SEO poisoning.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/aws?keyword=swann+security+systems+manual+1080 In PDF document text
    • https://sakuvajavabese.weebly.com/uploads/1/3/1/3/131383602/2088346.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461204/normal_5fa365400fe67.pdfIn PDF document text
    • https://nonaxoboru.weebly.com/uploads/1/3/4/4/134467623/a34a2b42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389571/normal_5f8ea947a30cd.pdfIn PDF document text
    • https://wosowabo.weebly.com/uploads/1/3/4/3/134340570/widewuribaxa.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/91341c2d-b022-49be-9826-686a7a252918/31590343089.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3176c308-4f92-4bc5-a0c1-0676581667fa/55665791335.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8783294-70c1-4c0f-83fe-25ba9eae478c/36538900705.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b2edb81-ac66-486e-8bcf-d46a8185af33/international_4300_dt466_service_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/busutafitufe/woke_up_like_this_playboicarti_mp3_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6642c52a-9f71-477a-b1b8-e41fa2d9907a/30803380944.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_off0000ec53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC53 5628 bytes
SHA-256: ddcec8006bae191de6c45a7b793f25ed8589f4f4978a1024752ec43b05f19373
font_01_sfnt_off0000ff78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF78 10440 bytes
SHA-256: e11c3a7e2ca7774d299c808d493a347e15095dfbb844eb66713dff4de53c201b

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