PDF malware analysis — malicious · bd420d088c352950

MALICIOUS

PDF

86.3 KB Created: 2021-02-28 02:42:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20

MD5: b8b05dd75ec5b0f41d33e413d6e18a67 SHA-1: b095bbcdf0dab303ff7998d7724df95f1b8ef780 SHA-256: bd420d088c352950f8feb79d88061bd4a5d7e44bbb8b876ed245b7de7a53e655

196 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many of which point to PDF files hosted on various platforms, suggesting a link farm or redirector strategy. The presence of a UTM parameter in one of the URLs further supports a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and extensive linking are indicative of an attempt to redirect users to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9996

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://druttle.ru/123?utm_term=stephen+king+the+mist+creatures PDF link annotation
- https://xurexesezegurez.weebly.com/uploads/1/3/4/0/134096141/bavotu.pdfIn PDF document text
- http://jusukigib.sportsontheweb.net/what_is_bq_in_construction.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4409243/normal_600e3b71118aa.pdfIn PDF document text
- http://sudedelanefozuk.66ghz.com/movodogokiro.pdfIn PDF document text
- https://likifovufuli.weebly.com/uploads/1/3/4/5/134588617/28cdfd98ca.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4367940/normal_60138476d4d07.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4418791/normal_5ffd2b9d54933.pdfIn PDF document text
- https://tudegikugil.weebly.com/uploads/1/3/5/3/135317618/7326844.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4529095/normal_5fccfe7ec6699.pdfIn PDF document text
- https://kipopedetazezu.weebly.com/uploads/1/3/0/7/130775623/4086593.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
- http://wosumobikufiw.rf.gd/visalefojibovexosevojurit.pdfIn PDF document text
- https://s3.amazonaws.com/fajujiju/chrysotile_asbestos_safety_data_sheet.pdfIn PDF document text
- https://s3.amazonaws.com/sinadi/54188264106.pdfIn PDF document text
- https://s3.amazonaws.com/xebuvuwov/graphic_design_training_nyc.pdfIn PDF document text
- https://s3.amazonaws.com/fapaga/witosuxuwurub.pdfIn PDF document text
- https://s3.amazonaws.com/bajapovogam/navedukasivab.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
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000ea9a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEA9A	5252 bytes
SHA-256: `eeb0dca4860eaec2785e9cfb53ea14e1d559b1c3ce34b826815ff70da060f7b7`
`font_01_sfnt_off0000fc46.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFC46	11556 bytes
SHA-256: `1cf1b61fa71298799688ea0bebdff005a79e5d3f3a74cc3eff4446c472f9a5c9`
`font_02_sfnt_off000123ad.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x123AD	17632 bytes
SHA-256: `262c12e9bb779cba5801ee126bce5b18c08c178f6d1bd80dbb59a8483cf7f339`
`font_03_sfnt_off00013df8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13DF8	4324 bytes
SHA-256: `7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71`

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