Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e1237a0dab043ba…

MALICIOUS

PDF

46.3 KB Created: 2020-08-08 10:43:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: b918c69e81e480da692836f45b684167 SHA-1: 21ba8ce0963ee7d9b5a141e0c8c00e4833b69311 SHA-256: 1e1237a0dab043ba24fe0bfccc972217f05fa6e540b840b5ae39622512ddae91
194 Risk Score

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.ru/pify?keyword=bacteriophage+introduction+pdf In PDF document text
    • http://files.adamisbitsky.com/uploads/1/3/1/3/131380850/megogojavotiga_wezitumerovivad.pdfIn PDF document text
    • http://files.catherineemclean.com/uploads/1/3/1/0/131069950/tojusotoperarafuxotu.pdfIn PDF document text
    • http://files.marilynkelley.net/uploads/1/3/1/1/131164399/52e999.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://cdn.shopify.com/s/files/1/0433/7795/0881/files/77627002672.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8155/4325/files/chapter_9_capital_budgeting_techniques.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3117/5063/files/91441585546.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5687/4151/files/31825779090.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6509/8908/files/87526736717.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7695/1974/files/jebogopuzo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/81143567733.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0323/9835/files/rilosifebalolonot.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9776/6553/files/82037394588.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7509/3159/files/24105136402.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2763/5096/files/nojavi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B0E 5136 bytes
SHA-256: acb1688ac7dece90efd1c2001e40c1943abcc84e7bdc2055b554bc890b74d430
font_01_sfnt_off00007c76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C76 9788 bytes
SHA-256: 7ab8cb5c0852190dcf92bcf8466cd9d192a584bb505d4b684a06d23fe16884e3
font_02_sfnt_off00009de8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9DE8 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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