Malicious PDF — malware analysis report

Static analysis result for SHA-256 53cbb894d5ec3032…

MALICIOUS

PDF

82.5 KB Created: 2021-01-10 19:06:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 035a04c8b85c6622338e1a063e433ef4 SHA-1: 501fdf8f7d548e9b72b8738ad963f473dca25893 SHA-256: 53cbb894d5ec30320b39203849d5a9ccf57fbc61c1954928e82d1e3d3b639c7d
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 numerous external links, many of which are part of an SEO link farm designed to redirect users to potentially malicious content. The heuristic PDF_SEO_LINK_FARM and PDF_SEO_UTM_REDIRECTOR_LINK indicate a phishing or malware distribution attempt. The ClamAV detection further supports the malicious nature of the file. No scripts were extracted, but the overall structure and linked URLs suggest 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.
  • 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://traffnew.ru/aws?utm_term=beomaster+3000-+2+user+manual PDF link annotation
    • https://site-1174816.mozfiles.com/files/1174816/luketemupomixonesanosex.pdfIn PDF document text
    • https://site-1174654.mozfiles.com/files/1174654/bridge_to_terabithia_novel_study.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwifemi/dNghgjM/steam_inventory_value_extension.pdfIn PDF document text
    • https://site-1174988.mozfiles.com/files/1174988/rc_car_race_tracks_california.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465274/normal_5fa57983aff4f.pdfIn PDF document text
    • https://funiduned.weebly.com/uploads/1/3/4/7/134773133/f5e65ae005.pdfIn PDF document text
    • https://site-1177051.mozfiles.com/files/1177051/fltplan_go_app_android.pdfIn PDF document text
    • https://site-1179601.mozfiles.com/files/1179601/bilasedufubiw.pdfIn PDF document text
    • https://famudixapakowep.weebly.com/uploads/1/3/4/8/134855218/349058.pdfIn PDF document text
    • https://site-1237297.mozfiles.com/files/1237297/among_us_free_skins_and_pets_hack.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/kakekojezutok/amazfit_verge_app_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/geradi/credit_limit_worksheet_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/petuzutemixuvod/panacea_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/gozilum/wixiwuzitapupopefug.pdfIn PDF document text
    • https://s3.amazonaws.com/suximawo/pogogelevasinisoparo.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_off0000f7c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C0 5184 bytes
SHA-256: d0df436c47c4f29d8a385114e343db370188e7e6a0b7af2ac27293d197f4d5da
font_01_sfnt_off00010944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10944 10940 bytes
SHA-256: ff59f4a884804fc3d58d96507e0e1d739e6d240b08e325714323cbd7adefad44
font_02_sfnt_off00012e97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E97 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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