Malicious PDF — malware analysis report

Static analysis result for SHA-256 5db0c577edf8c78d…

MALICIOUS

PDF

39.1 KB Created: 2020-08-14 03:21:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 5bf5623b5d65541e907f4de570bf3436 SHA-1: c4b44a04a6961d8b104d92aec78d3007d3cf040f SHA-256: 5db0c577edf8c78dbe1a714ce1f4e0d8e373e935e0c176a75cb4bc9b8947ff13
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a redirector service known to host malicious content. The document body, though heavily obfuscated, contains text related to academic journals and a URL that is also present in the redirector link, suggesting a lure for users seeking academic papers. The ML classifier strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ttraff.cc/wb?keyword=ugc%20approved%20computer%20science%20journals%20list%202018%20pdf In PDF document text
    • http://files.firsttakeagency.com/uploads/1/3/0/7/130740092/91db25533fabd7.pdfIn PDF document text
    • http://files.cleancurves.com/uploads/1/3/0/7/130739697/wavaje.pdfIn PDF document text
    • http://files.jamesekdahl.com/uploads/1/3/0/7/130775245/gapiwujosona.pdfIn PDF document text
    • http://tenidavu.mohamedjabaly.com/uploads/1/3/1/3/131380390/5dd45.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3027/3434/files/tubinosijukudewipuzad.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0546/7035/files/list_of_new_appointments_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2136/8482/files/bogububutepeminixiwupigi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/1040/7069/files/14068592831.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5573/5199/files/97051172791.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2919/9005/files/antilog_table_in.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8140/9436/files/10469458856.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6113/9861/files/wokevekatovadekam.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5501/4298/files/elemental_evil_dnd_5e.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7497/7945/files/36519012480.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0593/4757/files/lexulitatozixad.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 6

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

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5850 6124 bytes
SHA-256: 53ec623608b74f1fac8a8fab828447b1b71a6f175655349af7b2bcb70ae8f674
font_01_sfnt_off00006d1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D1C 9996 bytes
SHA-256: 8105e0461af14a4fcb5939051bac582ca77f33457105812e62e5d5448fe0d801

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