Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7a884755e62323c…

MALICIOUS

PDF

92.4 KB Created: 2021-04-21 11:17:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3df480253118bb75278ebe3399e5b528 SHA-1: 19cde1ee093ab2ece290c8c1a7b466b679f52dd0 SHA-256: a7a884755e62323c6b7b7b4b5f4af6715f31b768da2926365c596ed212af2cdc
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and 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 0.9994

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/strik?utm_term=sony+s-master+digital+amplifier+dvd+home+theatre+system+manual PDF link annotation
    • https://cdn.sqhk.co/togodawexu/ijsgcOw/wuzin.pdfIn PDF document text
    • https://cdn.sqhk.co/mofosalamo/gfQLyij/52933584051.pdfIn PDF document text
    • https://cdn.sqhk.co/gejixoneku/jf8xigv/vapikoxa.pdfIn PDF document text
    • https://cdn.sqhk.co/vibefoparo/ghNRhdm/gajoli.pdfIn PDF document text
    • http://xonigej.mypressonline.com/acetilcolinesterasa_eritrocitaria.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374203/normal_60538caedb296.pdfIn PDF document text
    • http://vadakob.22web.org/dedobejelolag.pdfIn PDF document text
    • http://bumumapa.mypressonline.com/10191744977.pdfIn PDF document text
    • http://xulubapatoso.scienceontheweb.net/4781198685.pdfIn PDF document text
    • https://cdn.sqhk.co/jipuxoxukul/cmVn5SD/ashley_home_furniture_delivery_and_assembly.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503692/normal_604d6454d9cbe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/97eef334-6851-4ba6-932d-2e8d9450e83b/53530678597.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4813ee21-c0ee-4d7e-9ee5-380c2075d80c/44809665460.pdfIn PDF document text
    • http://gezupipul.rf.gd/wexipunadafutar.pdfIn PDF document text
    • http://jumuvurerurulap.rf.gd/73245831708.pdfIn PDF document text
    • https://s3.amazonaws.com/dukajevo/94456673121.pdfIn PDF document text
    • http://livirava.atwebpages.com/69124661364.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8530ac58-d59c-4082-94f2-5b78c21dd488/zapifefapes.pdfIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/how_long_will_a_john_deere_x300_last.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40014d94-410d-4f7d-a8d9-f8772b034707/femenikixejirimera.pdfIn PDF document text
    • https://s3.amazonaws.com/zakunafu/ronunubak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b50c553-0723-4561-a40a-8235876316e0/30879119683.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_off00010dd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD6 5752 bytes
SHA-256: 1cd229bdbd887b324f4bba3f0554f77c459b936595c64785236607027af837a7
font_01_sfnt_off00012155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12155 13156 bytes
SHA-256: 51b8afd26ab10c261aff3670a8f3e3f44841605b01886d4ff01567d0cd03dfa0
font_02_sfnt_off00014c37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C37 16192 bytes
SHA-256: 1ff76b967cdf3bc4238cb8097aa9d4755c8fb5bd66c4cf01391f6e70ad1e9315

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