Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9d29c5f4bd106aa…

MALICIOUS

PDF

123.5 KB Created: 2021-04-01 06:29:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 36b090d4e7c11f45da04962089c476fd SHA-1: 9f57f7125e65dcf03bcadec01cfc7a68a2e55b36 SHA-256: f9d29c5f4bd106aaffd7ce64634057d6fd99cc6a25017b65bad54e2844d7b9a5
126 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm. The ML classifier strongly suggests maliciousness. While no scripts were extracted, the presence of numerous external links, including one pointing to a potentially malicious domain, indicates a probable attempt to redirect users to malicious content or for SEO manipulation. The document's content itself is heavily obfuscated and appears to be junk data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/award?keyword=ppt+on+durability+of+concrete+pdf PDF link annotation
    • https://duvokazi.weebly.com/uploads/1/3/4/1/134108747/ffdfdab0b4ecb7d.pdfIn PDF document text
    • http://testvvd.xyz/what_are_the_three_branches_of_government_and_their_responsibilities_canadaw3sp3.pdfIn PDF document text
    • https://cdn.sqhk.co/gipagigo/76jfdcb/53326432657.pdfIn PDF document text
    • https://tusopapa.weebly.com/uploads/1/3/2/7/132712380/7636204.pdfIn PDF document text
    • https://mazaxijav.weebly.com/uploads/1/3/4/4/134488449/7668423.pdfIn PDF document text
    • http://gonzo-3d.com/dorney_park_weather_reportjtkb3.pdfIn PDF document text
    • https://cdn.sqhk.co/kikolibub/KdieifD/97485761843.pdfIn PDF document text
    • https://winozijatefazo.weebly.com/uploads/1/3/5/3/135327399/292583509cb6.pdfIn PDF document text
    • https://tenojamerefu.weebly.com/uploads/1/3/1/8/131857247/lipujulatowegakul.pdfIn PDF document text
    • https://nepibosumu.weebly.com/uploads/1/3/4/3/134363752/paxekujanum.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dixediw.epizy.com/86391366106.pdfIn PDF document text
    • https://s3.amazonaws.com/mikibetiv/what_is_the_generic_structure_of_recount_text_explain_it.pdfIn PDF document text
    • http://keladuwuk.rf.gd/how_to_set_alarm_on_sharp_clock.pdfIn PDF document text
    • https://s3.amazonaws.com/genedesowul/79087248155.pdfIn PDF document text
    • http://jezodefobagepa.rf.gd/58042029158.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018de4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18DE4 5212 bytes
SHA-256: 619381272f8eb3767b8238ec10ab84dfc0970e9ea51995b7b3db6141b34fcf89
font_01_sfnt_off00019fb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19FB3 13168 bytes
SHA-256: ee7b3e4862fe2b238c2dcd901ab62d0cfdb38212a8bcd4db377d7783a1c7d753
font_02_sfnt_off0001cb65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CB65 16060 bytes
SHA-256: d1a84ba8f0e4a827a048d387db8dd5dae3538f1c7e72415b16af587a9947cdc7

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