Malicious PDF — malware analysis report

Static analysis result for SHA-256 f53d97dd4eb6369e…

MALICIOUS

PDF

79.4 KB Created: 2020-12-26 12:59:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: c2d1f652d46697e8c5eae1e1917cade5 SHA-1: e65b041625b39ce7c8b7e3bd1b7a8a057378805c SHA-256: f53d97dd4eb6369e0554b7bac1accb7dc97c67ebc998e756ae10320b53d47917
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm and a redirector for phishing, specifically using an image lure related to 'New port richey evacuation zones'. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a social engineering attack designed to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://trafffi.ru/123?utm_term=new+port+richey+evacuation+zones PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454301/normal_5fdb13e3d8b64.pdfIn PDF document text
    • https://koxawikala.weebly.com/uploads/1/3/4/6/134643159/7931553.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375504/normal_5fbfb489bf4d3.pdfIn PDF document text
    • https://jifefovemerozix.weebly.com/uploads/1/3/4/4/134444698/gosiwetokiseki.pdfIn PDF document text
    • https://xunowarusaki.weebly.com/uploads/1/3/4/3/134371630/05dbdcb33e88.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385012/normal_5fc6df3e40d38.pdfIn PDF document text
    • https://wufujaxuwagax.weebly.com/uploads/1/3/4/4/134400484/xunipinarog.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451355/normal_5fdf38685f8e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388040/normal_5fa81389cf758.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/tazopaju/91555732076.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/robotics_in_civil_engineering.pdfIn PDF document text
    • https://s3.amazonaws.com/lumixi/the_professor_and_the_madman_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vipinib/reality_testing_worksheet.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B5 5144 bytes
SHA-256: 90e143226a1be76d48869060718bf6aa2c857df5190cb2e0a4023417fa741349
font_01_sfnt_off0000f554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF554 13140 bytes
SHA-256: e2f330b13ae5d77d6c1388adb6372237dc27e3b569104937e98d98b675e57e6b
font_02_sfnt_off0001224f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1224F 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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