Malicious PDF — malware analysis report

Static analysis result for SHA-256 3160cdbfa3a01a7f…

MALICIOUS

PDF

69.0 KB Created: 2021-01-15 00:30:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 7369266c422113b0bc62a9299a94b3ba SHA-1: af5f0a8b81ed0939a4d71d8de3bdccf5b38708fe SHA-256: 3160cdbfa3a01a7f7003f7d28c265ae0650135de188443617d281e653c66177a
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The embedded document body text, though heavily obfuscated, contains a URL that appears to be part of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • 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://traffine.ru/aws?utm_term=fishing+report+manukau+harbour+2018 PDF link annotation
    • https://site-1216672.mozfiles.com/files/1216672/ocoee_river_tennessee_fishing.pdfIn PDF document text
    • https://site-1242277.mozfiles.com/files/1242277/asc_740_tax_reform_2017.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466664/normal_5fc94f1c63f07.pdfIn PDF document text
    • https://site-1168274.mozfiles.com/files/1168274/ziwapuxunijuruzukodi.pdfIn PDF document text
    • https://nalatuzub.weebly.com/uploads/1/3/4/3/134324595/6475948.pdfIn PDF document text
    • https://site-1166597.mozfiles.com/files/1166597/muwovijiwebulojof.pdfIn PDF document text
    • https://luzodogapop.weebly.com/uploads/1/3/4/2/134265842/leteposepaworud-pupuwesiru.pdfIn PDF document text
    • https://xumulevaz.weebly.com/uploads/1/3/5/3/135348617/pujesegawilimubusa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465935/normal_5fd34af6c473c.pdfIn PDF document text
    • https://zenamuvevabun.weebly.com/uploads/1/3/1/4/131453902/vavakewax_loxelevinure_peluzisesapoxuz.pdfIn PDF document text
    • https://vonepegoparopew.weebly.com/uploads/1/3/4/3/134352316/jutiritemo.pdfIn PDF document text
    • https://mawosamaretezij.weebly.com/uploads/1/3/4/8/134860838/8151645.pdfIn PDF document text
    • https://ferateritilew.weebly.com/uploads/1/3/4/2/134265971/f7590107f7d4cb.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_off0000d133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD133 5880 bytes
SHA-256: 5cd3964be700f64d1f5a6a0a048dac35617474120f219536c3853ab33b400ce4
font_01_sfnt_off0000e511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE511 9984 bytes
SHA-256: be4c7628e5c5202b2c0d70831d4b682514935444e84a6f26dc3d6b542120e18d

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