Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a07a99cfe6fa00b…

MALICIOUS

PDF

75.5 KB Created: 2021-03-11 20:21:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 2d0b651264316d7b131af7faf3c41370 SHA-1: b4e1ad66de847030f4d52b918c68be999d6eb4ad SHA-256: 3a07a99cfe6fa00b91dbfa2aba0a0c66546f36d3e2204e4481400f4e3b9776bf
196 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a link farm with numerous external links, including one pointing to a redirector at 'https://bologen.ru/wix?keyword=enzyme+action+testing+catalase+activity+lab+answers'. This suggests a phishing or malware distribution attempt, masquerading as a legitimate document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://bologen.ru/wix?keyword=enzyme+action+testing+catalase+activity+lab+answers PDF link annotation
    • http://cosmicgig.com/66267557889278i2.pdfIn PDF document text
    • https://jazemajotejavux.weebly.com/uploads/1/3/2/6/132681398/2bd39dbefcef4f5.pdfIn PDF document text
    • http://zujewap.mygamesonline.org/37070489859.pdfIn PDF document text
    • http://recepty-dd.info/10040260635itu0f.pdfIn PDF document text
    • https://zevakevo.weebly.com/uploads/1/3/5/4/135400716/gadiju.pdfIn PDF document text
    • https://wijedokimevu.weebly.com/uploads/1/3/4/6/134649091/dotigomujud.pdfIn PDF document text
    • http://blue-tick-central.com/free_christmas_invitation_templatesq0or1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501632/normal_602421d638694.pdfIn PDF document text
    • https://buzoraxuv.weebly.com/uploads/1/3/4/3/134366179/717d5.pdfIn PDF document text
    • http://capridigi.com/ink_cartridge_for_hp_j4680_printer6fojb.pdfIn PDF document text
    • http://bekopomulasebi.getenjoyment.net/jifipitali.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366000/normal_5fcbf1efe38a6.pdfIn PDF document text
    • http://ruwufuwetoj.mygamesonline.org/fuzunadut.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/gudukupir/foggy_dew_sheet_music_guitar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24006614-4748-4857-8899-267723e7c334/40356016697.pdfIn PDF document text
    • https://s3.amazonaws.com/bakoloj/wimewetilu.pdfIn PDF document text
    • http://lesidiwajenowil.myartsonline.com/fexarenusaguvopaliwasol.pdfIn PDF document text
    • https://s3.amazonaws.com/muvojugejoxip/zewujinukewomelabisa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74a99466-abb6-45d0-8045-e22844fae60c/tujepipunepavotal.pdfIn PDF document text
    • https://s3.amazonaws.com/xoferuzu/92579682100.pdfIn PDF document text
    • https://s3.amazonaws.com/mizeteb/security_company_business_plan_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f303ba9a-dcb2-45d8-ac57-8a0acb10e1f9/why_does_my_jenn_air_oven_keep_beeping.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fda399fe-6efd-45f2-a56c-aa0cfb7bd359/honeywell_6160_keypad_address.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_off0000e8fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FE 5520 bytes
SHA-256: 06ec5ea68351dda4ba5d846bfda2e0c9f69c08bfc85a00fc9d9746cc4a3cbb3c
font_01_sfnt_off0000fbd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD4 10564 bytes
SHA-256: 90dc0d2539fb496a8eb920a2d1ab2485f954a78c003c4ea631cf10019d3dc847