Malicious PDF — malware analysis report

Static analysis result for SHA-256 87db3ecd02aa9f5e…

MALICIOUS

PDF

42.5 KB Created: 2020-11-07 04:01:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: b8561ceac86b16123e11577a4f3e6ffa SHA-1: 27a97b157da8a60ff115b775754f789190991ce2 SHA-256: 87db3ecd02aa9f5e925f29fa435b5a4a18b43fabb8a231cb412c2368d3111739
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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://traffking.ru/123?keyword=pine+river+backus+school+district+mn PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4414486/normal_5f98a1d123afb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401971/normal_5f92890a616aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368468/normal_5f8a3167356f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418180/normal_5f9d8f6aee8a6.pdfIn PDF document text
    • https://sabijodamibig.weebly.com/uploads/1/3/0/7/130775907/kokori.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366302/normal_5f9757efcb3bf.pdfIn PDF document text
    • https://gemenudotipetal.weebly.com/uploads/1/3/2/6/132695720/vetetikosotuzafiwop.pdfIn PDF document text
    • https://sumijiluwovoj.weebly.com/uploads/1/3/4/2/134266387/jarizirapa-kiriximimegeb-wokorajunad-desisikoxu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://kitobus.files.wordpress.com/2020/11/64238790046.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/checkers_board_game.pdfIn PDF document text
    • https://lomajunon.files.wordpress.com/2020/11/woxupotetigimovixopife.pdfIn PDF document text
    • https://gezafetino.files.wordpress.com/2020/11/livanagotuniju.pdfIn PDF document text
    • https://rukawakoxofo.files.wordpress.com/2020/11/shinmai_maou_no_testament_bd_season_2_sub_indo_streaming.pdfIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/gre_physics_practice_book.pdfIn PDF document text
    • https://s3.amazonaws.com/bisegilupuf/rhetorical_devices_in_perils_of_indifference.pdfIn PDF document text
    • https://dututired.files.wordpress.com/2020/11/20743606408.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_off00006331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6331 5444 bytes
SHA-256: 7ce5b9fc41abb094a657d793148c1ef0b814d37f1e63eb2ce463b2370abc1a4d
font_01_sfnt_off0000758c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x758C 11552 bytes
SHA-256: 6e9391aeec825ad326303492af8ccf6542d654e04c5ab0465b739f497e87ec48

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