Malicious PDF — malware analysis report

Static analysis result for SHA-256 55471ea6cf16b9ed…

MALICIOUS

PDF

87.8 KB Created: 2021-04-11 22:50:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 80c8d85fcd500106eb8c848dc71eb269 SHA-1: ddb8ba5e3e5dd5d0a657e3df04876a6295d1e775 SHA-256: 55471ea6cf16b9ed2bfceaf38fffe429ae0de32f85271a0c16d6a5ef5269a82d
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by both ML classification and ClamAV, indicating a high likelihood of malicious intent. The document contains a large number of external links, many of which are on disposable hosting, suggesting a link farm or phishing lure. The primary URL, 'https://ponafet.ru/strik?utm_term=netgear+n600+wifi+cable+modem+router+manual', is likely part of a phishing campaign or SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=netgear+n600+wifi+cable+modem+router+manual PDF link annotation
    • https://cdn.sqhk.co/lojibuwe/B3Ihiif/xuxalivi.pdfIn PDF document text
    • https://cdn.sqhk.co/godajaxox/Lgg4oib/total_war_three_kingdoms_gongsun_zan_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/liripudeb/Cihd6vM/need_for_speed_no_limits_hack_ios_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/ratobomebal/jeihfid/evowars._io_unblocked_at_school.pdfIn PDF document text
    • https://cdn.sqhk.co/muligumixe/fGBgfjg/bacon_escape_2_all_characters.pdfIn PDF document text
    • http://nepatokada.mypressonline.com/83664407481.pdfIn PDF document text
    • https://sedapelagug.weebly.com/uploads/1/3/4/1/134109100/9535510.pdfIn PDF document text
    • https://sasozubavurak.weebly.com/uploads/1/3/4/8/134886198/kumisabuje.pdfIn PDF document text
    • https://cdn.sqhk.co/zimopaji/4zp3ghj/craigslist_atlanta_for_sale_by_owner_bikes.pdfIn PDF document text
    • https://nawajutexi.weebly.com/uploads/1/3/4/1/134108687/zematefejugufamusuva.pdfIn PDF document text
    • https://cdn.sqhk.co/xawefigi/fyjahad/fazupakomo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pivetuzadujo/hardest_harry_potter_quiz_youll_ever_take.pdfIn PDF document text
    • https://s3.amazonaws.com/megujobemegor/5592911371.pdfIn PDF document text
    • http://kagijido.myartsonline.com/convert_scanned_to_word_document_online_free.pdfIn PDF document text
    • https://7e073981-ad1c-4081-8dc0-76946ba36063.filesusr.com/ugd/c4f63d_140d3dfcb7384383ba6010d7e8420075.pdf?index=trueIn PDF document text
    • https://c534e673-b245-4a6d-8787-855fe96db707.filesusr.com/ugd/e19215_94ee8809402d46dc8b53a53b5d8f5287.pdf?index=trueIn PDF document text
    • https://f89b8795-a90f-4359-81e0-6309601a98d9.filesusr.com/ugd/8e7730_40ecd86bd21c43ff87fd8c5fb760f3a9.pdf?index=trueIn PDF document text
    • https://9f349447-249b-4747-956a-316fe86e371b.filesusr.com/ugd/d2b720_385fccd0a0fc4f2a8367c79b50b7ef7e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pewebopufupe/the_power_of_love_celine_dion_release_date.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_off00011668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11668 5660 bytes
SHA-256: 96700a26255b9e525883ce99fe16ade3747a01ba366be1a58d70b215cccb7611
font_01_sfnt_off000129aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129AA 11776 bytes
SHA-256: bdf6db197a8ef67ce322262b6cdffd26c637ea88bc1b6d549fda6a0e2385d444