Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c30ca0f5ef12d45…

MALICIOUS

PDF

42.0 KB Created: 2020-10-28 20:27:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: ba14134f2c2460938d04ffce88ce8df7 SHA-1: e79db98032ad7b9cd3b84275428bfceb53d357d7 SHA-256: 1c30ca0f5ef12d4555a1c97ad03d650edd03387b0de05b274922dd538e9b186f
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, including one identified as a malicious redirector, disguised as a 'tenant walk through checklist pdf'. This suggests a phishing or scam attempt to lure users to a malicious site. The ML classifier also strongly indicated maliciousness, supporting the assessment of a phishing attack.

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.com/123?keyword=tenant+walk+through+checklist+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367944/normal_5f99037450333.pdfIn PDF document text
    • https://kizekusoviwo.weebly.com/uploads/1/3/1/4/131453028/sevogotili.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388156/normal_5f9144843fde8.pdfIn PDF document text
    • https://jaketomerinojox.weebly.com/uploads/1/3/4/1/134109184/0b9270737.pdfIn PDF document text
    • https://zenefuzivoxog.weebly.com/uploads/1/3/4/1/134108933/2929811.pdfIn PDF document text
    • https://jowesezowu.weebly.com/uploads/1/3/4/3/134366841/gavefatoxofideza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391327/normal_5f95f0ac19dec.pdfIn PDF document text
    • https://pasuliwipo.weebly.com/uploads/1/3/1/4/131452824/tegafevutu-narusoka-vejevelid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365591/normal_5f8743fe1ffc0.pdfIn PDF document text
    • https://mupibidegupek.weebly.com/uploads/1/3/0/8/130874042/6752891a.pdfIn PDF document text
    • https://zafozudakajadev.weebly.com/uploads/1/3/0/8/130814863/xujewonagamaxu.pdfIn PDF document text
    • https://bigubuwona.weebly.com/uploads/1/3/4/3/134309174/cb5f47f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380214/normal_5f8de61134b64.pdfIn PDF document text
    • https://zalopajozi.weebly.com/uploads/1/3/1/4/131453352/bazagudaw.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/lopazura/eureka_airspeed_vacuum.pdfIn PDF document text
    • https://s3.amazonaws.com/fajixe/59772920652.pdfIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/bojawevujosavinimari.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8f3178b-85d8-4c60-9086-2f16575fd2e2/13086651178.pdfIn PDF document text
    • https://s3.amazonaws.com/dadupawo/ley_de_elecciones_primarias_en_bolivia_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/mukutud/statistical_analysis_in_excel_2016.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/lajudidolefajofaju.pdfIn PDF document text
    • https://s3.amazonaws.com/bitizopovopaso/bedewifufifozututebapovi.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/logic_gates_in_digital_electronics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ea01c56-fb32-4344-bfbf-b7cb61e12297/47746502049.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.

FilenameKindSourceSize
font_00_sfnt_off00006370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6370 5524 bytes
SHA-256: c18904ca0c325692f2cd0357a679be16fbed3029a6d9d3b3e8441dd2441b5a91
font_01_sfnt_off00007647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7647 10804 bytes
SHA-256: 6930eb7d9f6f77bf79b298ac7b476e7527faf62c8c8ffb8224451b40262d340a