Malicious PDF — malware analysis report

Static analysis result for SHA-256 88f38073c151e6c3…

MALICIOUS

PDF

41.8 KB Created: 2020-03-26 02:45:39 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-08-25
MD5: 5377f3918f25c5d439b82f7472957b2a SHA-1: 978b9d9774ca39e7288981e1de03da8c1431c297 SHA-256: 88f38073c151e6c3d928a04182768e4e56dc925d80a862485d8e73ffa26912fd
136 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many with numeric slugs, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it is designed to redirect users to potentially malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://biomaxresearch.net/uploads/1/3/0/7/130739742/130739742.html#imagen+del+oso+panda+para+colorear PDF link annotation
    • http://dancewithqi.com/uploads/1/3/0/6/130605331/3539352.pdfIn PDF document text
    • http://pinktopia.org/uploads/1/3/0/6/130621187/24d1b295b3.pdfIn PDF document text
    • http://al7erak247.com/uploads/1/3/0/5/130547405/320beebb.pdfIn PDF document text
    • http://www.vakantie.folderplaats.nl/uploads/1/3/0/3/130323997/ligutadiv-gexefesuzisi.pdfIn PDF document text
    • http://thelordswriter.com/uploads/1/3/0/2/130287506/lesurerituzukul_mipifowunawuta.pdfIn PDF document text
    • http://ns2.creativeresourcesinc.net/uploads/1/3/0/2/130288320/bbfad6685bbb.pdfIn PDF document text
    • http://mostlyaboutmoney.com/uploads/1/3/0/7/130738765/513470f7ea.pdfIn PDF document text
    • http://www.spotlfy-subscription-confirmation.com/uploads/1/3/0/7/130775265/5ef2d379a1.pdfIn PDF document text
    • http://dumarsinc.com/uploads/1/3/0/5/130545241/6e37f.pdfIn PDF document text
    • http://adrienneodell.com/uploads/1/3/0/7/130739934/ec7011c1595.pdfIn PDF document text
    • http://powershotsus.com/uploads/1/3/0/5/130550857/moxiwowipafe.pdfIn PDF document text
    • http://www.versatilepumpsandfabrication.com/uploads/1/3/0/2/130287977/2e55082652.pdfIn PDF document text
    • http://jamesshop.net/uploads/1/3/0/4/130436050/9de6cb72.pdfIn PDF document text
    • http://mentok.net/uploads/1/3/0/7/130775014/3677864.pdfIn PDF document text
    • http://niagarawellbeing.org/uploads/1/3/0/5/130539267/xerogubikuwejun-jaxuz.pdfIn PDF document text
    • http://artbookblog.org/uploads/1/3/0/7/130739782/vogek-mudop.pdfIn PDF document text
    • http://rvrepairaustin.com/uploads/1/3/0/2/130289651/livefujizo.pdfIn PDF document text
    • http://mta-sts.led-ombouwset.nl/uploads/1/3/0/4/130489418/bofaj-gebimedolugetut-kegez-dujela.pdfIn PDF document text
    • http://mitchellgribbroek.com/uploads/1/3/0/6/130621765/lisagomo.pdfIn PDF document text
    • http://healthypleasuremx.com/uploads/1/3/0/6/130603944/6289148.pdfIn PDF document text
    • http://shop.lonestarwildernessmedicaltraining.com/uploads/1/3/0/4/130493389/3c431973fe54835.pdfIn PDF document text
    • http://mykindoffamily.com/uploads/1/3/0/2/130272384/zasipafof.pdfIn PDF document text
    • http://revivemobiledevicerepair.com/uploads/1/3/0/9/130969222/2342020.pdfIn PDF document text
    • http://74-123-75-107.mgwnet.com/uploads/1/3/0/4/130478648/waxuxis.pdfIn PDF document text
    • http://kredihold.com/uploads/1/3/0/8/130874120/8447672.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

Related samples 8

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_off00006fe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FE6 8432 bytes
SHA-256: 680ea6f14778a2914e6258374ff84292c8c44eafc9b62a746d19378c51f59df6
font_01_sfnt_off00008eb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EB4 1708 bytes
SHA-256: 83459e82cebe561b9e65dda6a09953c9e35f75e5df0fa62a624e1833cc5b8086

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