Malicious PDF — malware analysis report

Static analysis result for SHA-256 efb3209b298db053…

MALICIOUS

PDF

82.8 KB Created: 2021-03-20 09:19:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 1894529d23ea04228d33efcbdbc24220 SHA-1: bb964707c8421c6c40bbfba386388e91c03f1715 SHA-256: efb3209b298db053ad9944aa42c6f88b2f6c0e4fb30e8918ef39cc136dadc437
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URIs, with a primary URL pointing to a site that appears to be part of an SEO manipulation scheme. The presence of a large number of external links, some hosted on disposable domains, suggests an attempt to artificially inflate search engine rankings or distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://golowaki.ru/strik?utm_term=how+much+do+interior+designers+make+a+day PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365540/normal_600f26a42bcc8.pdfIn PDF document text
    • https://leziwave.weebly.com/uploads/1/3/4/4/134446015/cfe67c.pdfIn PDF document text
    • https://cdn.sqhk.co/kukugejekibi/kibjeii/herniated_disc_bowling.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500887/normal_602df70e2984f.pdfIn PDF document text
    • https://waxaveroguwako.weebly.com/uploads/1/3/5/3/135344917/xawude-repaj-pevad-vomadomupug.pdfIn PDF document text
    • https://janikopet.weebly.com/uploads/1/3/4/6/134690806/8f4d9bc2253.pdfIn PDF document text
    • https://fasiwuwazaxeba.weebly.com/uploads/1/3/1/4/131438460/rakuduwatizur.pdfIn PDF document text
    • https://galezarulunozip.weebly.com/uploads/1/3/4/8/134896955/fevus-wuvag-tegutuwolit-guxafajazekoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487208/normal_6039c46e58521.pdfIn PDF document text
    • https://defupodanujazi.weebly.com/uploads/1/3/5/3/135346118/wewaxuvot_segururefewubi_wozelujumugibu.pdfIn PDF document text
    • https://kamapapidez.weebly.com/uploads/1/3/5/9/135962567/kozolokekemapizos.pdfIn PDF document text
    • https://cdn.sqhk.co/wepunajexiju/UkjbWii/exorcist_cast_now.pdfIn PDF document text
    • https://moginirem.weebly.com/uploads/1/3/4/7/134769545/1786860.pdfIn PDF document text
    • https://bosowumajozidu.weebly.com/uploads/1/3/0/7/130740465/tunidos.pdfIn PDF document text
    • https://dataremidesop.weebly.com/uploads/1/3/4/6/134697992/bivukekerofamuxopun.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/ed736356-9944-4f4c-aa42-f671872a3056/9195976353.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5426050-b952-4a7a-ab31-c0553329f1f7/zufawuwamaxusineneje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c598ad63-aa83-4018-ab79-4cc9e4981d3a/what_is_the_meaning_unity_of_time.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b63c3dd-30ac-4745-9a34-cdadb268321b/how_to_refurbish_typewriter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d74d855-c338-4545-91d4-57b50521e4c9/breville_juice_fountain_plus_juicer_amazon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/339390f5-6180-4452-9330-a041df25f889/17893523665.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_off00010654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10654 5540 bytes
SHA-256: cda7d3ff5adf1ec494ec93b5f00b34ca750edf6be2b5f471c64094a1d61f3f23
font_01_sfnt_off00011912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11912 10864 bytes
SHA-256: 14b3795d8824d0678bd32658415140399c944bcd6a8555c634f5fd979ce4ef1a