Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe008381d2b60c25…

MALICIOUS

PDF

80.9 KB Created: 2021-06-04 20:28:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: fa98925e2d681147eefd4b5bf25239e0 SHA-1: 0ad2942762629c89a993d8e3e19358e51407d507 SHA-256: fe008381d2b60c252ee6b90afcb45113bfd4b92cba23f5f2ba88ae81c123d69b
126 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. The primary URL, 'https://allytemp.ru/pbw?utm_term=buet+msc+in+eee+admission+test+question+paper', is presented as an admission test paper, a common lure for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and extensive URL usage indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://allytemp.ru/pbw?utm_term=buet+msc+in+eee+admission+test+question+paper PDF link annotation
    • https://fadafiwu.weebly.com/uploads/1/3/5/3/135302778/719234.pdfIn PDF document text
    • https://gupoxebexu.weebly.com/uploads/1/3/4/3/134337811/womisafuz.pdfIn PDF document text
    • https://namuxewanazojo.weebly.com/uploads/1/3/4/2/134266474/kakejesewuf.pdfIn PDF document text
    • https://pegugigatusib.weebly.com/uploads/1/3/4/4/134460290/4b46b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408713/normal_601b1e32b1d44.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456671/normal_60281b91b07b2.pdfIn PDF document text
    • https://wopurosifagup.weebly.com/uploads/1/3/5/3/135333772/janowobixedu-sawogesuraxor-vusug.pdfIn PDF document text
    • https://dabagurujor.weebly.com/uploads/1/3/4/3/134350609/bowobom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473919/normal_603c10b49e28e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c748a4d-ff10-4311-a90f-1552852425e8/92377750302.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab8e3b40-4cb2-432a-8fe0-2c9dd1011221/lupazoti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03addb8c-aa09-4cee-9dec-1d85c4a970fd/52659950325.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b92a5413-3de1-4911-a268-2a4e96e6ad26/scott_trench_set_for_life_podcast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88bb328a-3646-4cdd-88e8-0fcd87feabf3/gofofipivajuladezopil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e5955d5-a4eb-4481-be1b-2396fb6f2faf/vebugefupisubo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc61a614-2850-4b82-b2f3-aedf4de39ca8/11455038069.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d49068e-f2f2-42e5-8e97-97156fc1b2f5/what_is_the_most_reliable_zero_turn_mower.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE218 5364 bytes
SHA-256: 13ef1417ee7cba4d5d3294699cf6a873238c8cfd47ac69e1c16033f7eae56d55
font_01_sfnt_off0000f433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF433 3940 bytes
SHA-256: 39c639b46434e143623692592b027a341feb83d099bfba15ded02d5ef9e4c8ee
font_02_sfnt_off0001008b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008B 5812 bytes
SHA-256: cd0f4459de52dfd6ad42251c6369362a9af6018fafeec65dcaeb8cee15515f08
font_03_sfnt_off00010f22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F22 11280 bytes
SHA-256: 775bca4bee077088445b5d5de78ae953272892e44c32035ee27ebc8952ff186c