PDF malware analysis — malicious · d820ac444d55d5b9

MALICIOUS

PDF

79.7 KB Created: 2021-03-11 18:23:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20

MD5: 230b54caced85c2aecc356b1bcbb833a SHA-1: b61cbb2cecd0389791e021882390f6c61abe155a SHA-256: d820ac444d55d5b9ea19281b43f647232bb573bde92bcb6cda723ae092a2cbbb

196 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by multiple heuristics and an ML classifier, indicating a phishing or trojan delivery attempt. It contains a large number of external links, many pointing to SEO-optimized PDF files, suggesting a link farm or redirector strategy. The primary URL, 'https://pelibifir.ru/wix?keyword=density+worksheet+1+answer+key', appears to be an image lure for phishing, disguised as a legitimate document. No scripts were extracted, but the PDF structure and numerous external links strongly suggest it's designed 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://pelibifir.ru/wix?keyword=density+worksheet+1+answer+key PDF link annotation
- https://sajofagexureleb.weebly.com/uploads/1/3/4/6/134652103/1470342.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4426550/normal_602381157bc98.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4369525/normal_6007d38c028ed.pdfIn PDF document text
- http://ribadubeko.scienceontheweb.net/how_to_reset_a_braun_digital_thermometer.pdfIn PDF document text
- https://fubediko.weebly.com/uploads/1/3/1/0/131070718/jonina.pdfIn PDF document text
- https://nitiruminaxodax.weebly.com/uploads/1/3/0/7/130738633/9c171f51b7.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4412780/normal_6037bc0a5dd8f.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4415934/normal_604943c1178e7.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4408704/normal_6029d58b39a50.pdfIn PDF document text
- https://mikugixu.weebly.com/uploads/1/3/1/4/131438693/wukabojazovasenefer.pdfIn PDF document text
- https://suzokapiwewop.weebly.com/uploads/1/3/4/3/134351383/8abc4.pdfIn PDF document text
- https://jevezorubik.weebly.com/uploads/1/3/4/8/134864628/geburufuwe.pdfIn PDF document text
- http://bumasujofoj.getenjoyment.net/61831569904.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/wuniku/8421034302.pdfIn PDF document text
- https://s3.amazonaws.com/wofaxil/auggie_and_me_online_free.pdfIn PDF document text
- https://s3.amazonaws.com/wewiro/43510331241.pdfIn PDF document text
- https://s3.amazonaws.com/fosagobomap/saxulokebomup.pdfIn PDF document text
- https://s3.amazonaws.com/jivamubug/genetodo.pdfIn PDF document text
- https://s3.amazonaws.com/gisujubolidine/44306540923.pdfIn PDF document text
- https://s3.amazonaws.com/kelageketisefuv/all_transformers_revenge_of_the_fallen_toys.pdfIn PDF document text
- http://limoxukuk.atwebpages.com/99737398176.pdfIn PDF document text
- https://s3.amazonaws.com/tumuzu/dewalt_dcd771c2_20v_max_lithium-ion.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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000fc40.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFC40	5052 bytes
SHA-256: `89f893de009c6fd351788b8f8586a1a28fd96628cf7d0e847d64ef960fbe1898`
`font_01_sfnt_off00010d8b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10D8B	10592 bytes
SHA-256: `2f01fc19a01369bff02ee2a88a8f51306f367430e98e042f0e4c60fc9d14cfb3`

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