Malicious PDF — malware analysis report

Static analysis result for SHA-256 31d1e950fbb7c678…

MALICIOUS

PDF

82.9 KB Created: 2021-04-14 20:22:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 16e07167b691e929f1fee180d19159da SHA-1: 1983c3680da4e49da9c3960f9051aad9d9118a47 SHA-256: 31d1e950fbb7c678cec6dbd12a6d3fab2dd509830fb5856294d877b7b15f7a33
126 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicative of a link farm. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the presence of numerous external URLs suggests an attempt to redirect users to potentially malicious sites, possibly for SEO manipulation or to serve further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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.
  • 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.
  • 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://ponafet.ru/strik?utm_term=how+to+program+a+motorola+xts+5000 PDF link annotation
    • https://bokefelefu.weebly.com/uploads/1/3/1/3/131383825/ace9ba7f.pdfIn PDF document text
    • https://dojosofezi.weebly.com/uploads/1/3/5/3/135390984/gazitigo.pdfIn PDF document text
    • https://luwobidope.weebly.com/uploads/1/3/0/8/130814225/c095ab9f078.pdfIn PDF document text
    • https://torolanomopefi.weebly.com/uploads/1/3/0/7/130739669/zonatuxafij.pdfIn PDF document text
    • https://gozanesudobewer.weebly.com/uploads/1/3/4/8/134852120/043184.pdfIn PDF document text
    • https://fugazuxelodurip.weebly.com/uploads/1/3/4/6/134639195/325ce2130a0e.pdfIn PDF document text
    • https://vixagukire.weebly.com/uploads/1/3/4/3/134364056/jibinipup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372399/normal_603b92052430a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453888/normal_60385974c5f57.pdfIn PDF document text
    • https://funifagokose.weebly.com/uploads/1/3/2/6/132681236/lejuwesub.pdfIn PDF document text
    • https://luselovuxetox.weebly.com/uploads/1/3/0/7/130739290/5874440.pdfIn PDF document text
    • https://posoxoniboje.weebly.com/uploads/1/3/4/7/134713430/5248629.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450247/normal_5ffca05b1803b.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://uploads.strikinglycdn.com/files/8022ed6a-8434-467b-a67a-61019d92b098/84536150669.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9aa544d0-85d6-42aa-9ec9-8519a5efae0b/poledekonibojoxu.pdfIn PDF document text
    • https://cdfb6f36-dde2-4af5-b3b7-55ff39976061.filesusr.com/ugd/c6ac46_609067ce9e8c45f58a617a401f584b73.pdf?index=trueIn PDF document text
    • https://16e729f2-8c5c-4787-b670-14aeba6c5e03.filesusr.com/ugd/ac55e2_d1422e451718489ea402a8e662946959.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd8835e0-67f1-4be3-bc7c-297df2e3365b/oracle_19c_vversion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02114711-cf1d-432b-86f6-db80eec60c8a/43283657407.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/580d801f-67a2-4cfb-b7a3-31fd9dd21092/boravezusuxejoluguvebik.pdfIn PDF document text
    • https://0f285ee0-1b14-49a2-8a3e-060a2db94812.filesusr.com/ugd/4bf67f_f101f52eb63e4539bf6549f17cda3e48.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/701eaea9-0db2-4a1e-84da-1d7116b63d17/28367381263.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_off0000f8a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A8 5044 bytes
SHA-256: e7d2322f34e4f1c09e074549f7ffd1346e17e65eba186da0e5f5907d03341092
font_01_sfnt_off000109e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E1 10692 bytes
SHA-256: 7eb3202bc612deba26f0f49cab8d2ac2df49b02c3423051d933b93c955e08d56
font_02_sfnt_off00012e77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E77 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3