Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd5121b18d05f50d…

MALICIOUS

PDF

78.0 KB Created: 2021-04-25 15:05:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 8afda06ae613caa68db99bc017ebea75 SHA-1: 044699943f9df0f536bfc2fa85c8b01f1a5a4ec1 SHA-256: bd5121b18d05f50dce98d039d766355da172830aa1b694b7a9dd712f1c3afb78
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The presence of a 'fake error code' in the document body and the ML classifier's high confidence score indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jottigo.ru/strik?utm_term=error+code+03-80-00 PDF link annotation
    • https://cdn.sqhk.co/ditetona/TNKgfuA/25424808249.pdfIn PDF document text
    • http://lozhobelir.space/how_rich_was_mr_darcyz6jam.pdfIn PDF document text
    • http://werenntaq.online/27005128466e3ttn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403541/normal_5fd37668cb855.pdfIn PDF document text
    • http://blue-tick-central.com/for_cause_and_comradeshrpkc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446380/normal_6022c5f24d98c.pdfIn PDF document text
    • https://guxofoxevi.weebly.com/uploads/1/3/4/7/134737998/roxadizude.pdfIn PDF document text
    • https://josuriwomevopi.weebly.com/uploads/1/3/4/7/134769094/aab84e843bfa0.pdfIn PDF document text
    • https://cdn.sqhk.co/jufenakajo/ajijjBw/rivakup.pdfIn PDF document text
    • http://life-news.tech/insinkerator_badger_5_1_2_hp_garbage_disposal_reviewsaak4u.pdfIn PDF document text
    • https://pudawiwut.weebly.com/uploads/1/3/5/3/135342926/masojezek.pdfIn PDF document text
    • http://bilet-pdd.site/17578805804n9d6l.pdfIn PDF document text
    • https://cdn.sqhk.co/nusatabi/hhBiiE5/38232539657.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415740/normal_5ffde468649e9.pdfIn PDF document text
    • https://zelekunidos.weebly.com/uploads/1/3/2/6/132682808/mejoxefalaletudoro.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367922/normal_5fe380f533157.pdfIn PDF document text
    • https://cdn.sqhk.co/zasemewiti/jxKijfZ/mowofomojefazikuretad.pdfIn PDF document text
    • https://xobagosuwetir.weebly.com/uploads/1/3/2/6/132680986/wenez-xivimido-lurarax.pdfIn PDF document text
    • https://laxuwipulave.weebly.com/uploads/1/3/5/9/135956831/dcdf1.pdfIn PDF document text
    • https://fawitazekivaji.weebly.com/uploads/1/3/1/4/131454143/zobubiwejube-weruz-vonoximonewukib.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://51f47fa2-20f7-4ec4-bb91-8ae4aee689b4.filesusr.com/ugd/917232_7c3cae8036a64b6fb7267fee3c49fabe.pdf?index=trueIn PDF document text
    • https://9f349447-249b-4747-956a-316fe86e371b.filesusr.com/ugd/d2b720_c2f9ecccd1e844fea0944b2f8056c313.pdf?index=trueIn PDF document text
    • https://fae5df41-d68b-4d62-9961-cd33801cec7e.filesusr.com/ugd/f52c73_d8576d93259a4741898334c26f120cf1.pdf?index=trueIn PDF document text
    • https://47e244ab-6b1f-4ae7-97e8-86de5b619f9f.filesusr.com/ugd/e1d12c_bf2c2f0de3114b6ba8ec6a5e7b35b3fa.pdf?index=trueIn 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_off0000f6c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C9 5000 bytes
SHA-256: 516e81174c37105ba289084994ba1ad910e5effdb994a75151bf3d6497ba88fe
font_01_sfnt_off000107e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E7 10332 bytes
SHA-256: 4db28c605e5bc40d588ad7e4875c0a205ea96010165b45cc7660bd219041b70e