Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6bbddc902c3ab89…

MALICIOUS

PDF

74.7 KB Created: 2021-04-04 11:07:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 5046a9f01d56c0dd59ea5fa180e9072e SHA-1: b223ab959c96ef49be3c69c690f3cd93c964764e SHA-256: b6bbddc902c3ab89a44c4ab7cbe837d2c7a2d2c0d45894877a2fa00fa1fc370a
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to SEO redirectors and link farms, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_UTM_REDIRECTOR_LINK' strongly suggest this. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious intent, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://botokaw.ru/strik?utm_term=the+vegetarian+epicure+by+anna+thomas PDF link annotation
    • http://nakotigolajeg.scienceontheweb.net/sony_hdr-cx240e_memory_card.pdfIn PDF document text
    • http://waverufusufafuv.scienceontheweb.net/kekofuva.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425235/normal_603320137dec3.pdfIn PDF document text
    • http://skidki-day.store/19322924327tnepl.pdfIn PDF document text
    • http://shop-onlinediscount.xyz/bixby_voice_assistant_appykct7.pdfIn PDF document text
    • http://gokawojop.scienceontheweb.net/elementary_biology_book_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446633/normal_6032e2e270fdd.pdfIn PDF document text
    • https://sijejanuri.weebly.com/uploads/1/3/4/8/134861930/1439305.pdfIn PDF document text
    • http://montana-media.com/spelling_bee_word_list_for_10th_grade5xprd.pdfIn PDF document text
    • https://mefupajudeto.weebly.com/uploads/1/3/4/8/134883840/9137696.pdfIn PDF document text
    • http://wide-do.top/what_are_the_4_main_plate_boundaries6um7x.pdfIn PDF document text
    • https://turoliletipusu.weebly.com/uploads/1/3/5/9/135969349/b4f0d0.pdfIn PDF document text
    • http://maslovauto.ru/pojomimamalisevobepejumuxeuch.pdfIn PDF document text
    • https://datugabow.weebly.com/uploads/1/3/4/7/134745554/613555.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448551/normal_5fc9a4f7d3e3e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481513/normal_5fee716f225ae.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/fajujiju/wotogajosadeb.pdfIn PDF document text
    • https://s3.amazonaws.com/xupovobejanam/mupufusajenojugoti.pdfIn PDF document text
    • https://s3.amazonaws.com/sezebepit/char_broil_infrared_grill_grates_dishwasher.pdfIn PDF document text
    • https://s3.amazonaws.com/kafises/65604398112.pdfIn PDF document text
    • https://s3.amazonaws.com/futamo/93257340466.pdfIn PDF document text
    • https://s3.amazonaws.com/rojalexipokadaz/certificate_of_origin_re-_export_form.pdfIn PDF document text
    • https://s3.amazonaws.com/tozaduliwubega/84306622457.pdfIn PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/oxford_discover_3_workbook_answers.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_off0000e432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE432 5564 bytes
SHA-256: 0caef4db0c7189f7d5d14c3e3c245a53b8426f4c8677d980a5c1fd1ff7e3315a
font_01_sfnt_off0000f703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF703 10716 bytes
SHA-256: 20f564f846c693737bf52d31469149e39915e0a624cc739cbb725eeb09fae3a1