Malicious PDF — malware analysis report

Static analysis result for SHA-256 1175d0c2dd87e422…

MALICIOUS

PDF

93.3 KB Created: 2021-03-01 13:25:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 24d11fe844cfc9ec4aa6e29f2a2306f9 SHA-1: e77dfa5357839e30dcc0f2a320041ca113aaf724 SHA-256: 1175d0c2dd87e4221b5c724fe6bbcfedfb4d00cf1fb5c06e687a8b4f4081ec21
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many of which point to disposable hosting services, indicating a link farm designed for SEO manipulation or malicious redirection. The presence of a 'download button' heuristic further suggests a deceptive workflow. While no scripts were extracted, the ML classifier strongly flags this PDF as malicious, and the overall structure points to a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jacksth.ru/123?utm_term=participial+phrase+worksheet+with+answer+key+pdf PDF link annotation
    • https://gepogixuzusesil.weebly.com/uploads/1/3/3/9/133999736/ba741315ca.pdfIn PDF document text
    • https://jobadenel.weebly.com/uploads/1/3/1/1/131164033/wodiveru_laledomezage.pdfIn PDF document text
    • https://cdn.sqhk.co/sexuzoropa/dAiaAHO/soap_cutter_pro.pdfIn PDF document text
    • http://podarokinsta365.site/62050282751iqxx3.pdfIn PDF document text
    • http://daravto18.ru/4448569913qx5jg.pdfIn PDF document text
    • https://cdn.sqhk.co/xagaxubibiz/WqhdPhi/74273716357.pdfIn PDF document text
    • https://ziresaro.weebly.com/uploads/1/3/4/5/134509830/91041d.pdfIn PDF document text
    • https://cdn.sqhk.co/jasuxerazifo/gigd8Lw/swag_wallpaper_hd.pdfIn PDF document text
    • https://kusazejur.weebly.com/uploads/1/3/1/4/131437880/fuwetiwero.pdfIn PDF document text
    • http://snail-case.store/sample_resume_for_first_job_templated78dg.pdfIn PDF document text
    • https://zuvitapud.weebly.com/uploads/1/3/1/4/131406427/zimatap.pdfIn PDF document text
    • https://xovobinawulum.weebly.com/uploads/1/3/4/8/134883327/f67ab58.pdfIn PDF document text
    • http://tdsevsvet.ru/lois_lowry_gathering_blue5w4xs.pdfIn PDF document text
    • http://mnogolidov.xyz/tl_wpa4220_repeater44kn7.pdfIn PDF document text
    • http://aycotoro7.xyz/mafiraban8c4s.pdfIn PDF document text
    • https://sezebotari.weebly.com/uploads/1/3/1/6/131636698/bufibofesokumup_duvemo_mujazoz.pdfIn PDF document text
    • https://gidaxejopof.weebly.com/uploads/1/3/4/3/134305554/7099777.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zumuwojik.rf.gd/77469111154.pdfIn PDF document text
    • http://betugoxutufaf.epizy.com/what_is_the_most_viewed_christian_song_on_youtube.pdfIn PDF document text
    • http://ruludamena.epizy.com/jewelled_foil_crafting_guide.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_off00012d37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D37 5504 bytes
SHA-256: 7e6df5a085596e9bab8e9173ddedddfb007f6b9e37a3fcc6ffd27025f74e99c8
font_01_sfnt_off00013ffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FFD 11740 bytes
SHA-256: 0fb3f564553ecf251ca2d57b58962a80e1173392861f28c814826bc4b4480eb4

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