Malicious PDF — malware analysis report

Static analysis result for SHA-256 6145fffbb17d7fbd…

MALICIOUS

PDF

83.7 KB Created: 2021-03-29 07:54:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 91f2b928d65fd9879765f5edfbea78c1 SHA-1: 4f3a6cb15d7bca6c63ffee6456239c23da41d88c SHA-256: 6145fffbb17d7fbda9f9de23078570fbc51c7b24ed3b1f0a3cfe0f9e09d44c86
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external links to other PDFs hosted on various domains, including disposable ones. The primary URL, 'https://soxebez.ru/aws?utm_term=best+clear+case+for+samsung+galaxy+s9+plus', suggests a potential lure or SEO manipulation tactic. The presence of many external links and the use of disposable hosting point towards an attempt to distribute further malicious content or engage in 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://soxebez.ru/aws?utm_term=best+clear+case+for+samsung+galaxy+s9+plus PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4408461/normal_600106a809896.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426424/normal_60530871778b7.pdfIn PDF document text
    • http://zisezamerares.mygamesonline.org/how_to_find_time_period_in_physics.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385012/normal_603facaf275a0.pdfIn PDF document text
    • https://lotatodekimin.weebly.com/uploads/1/3/4/7/134705716/4092368.pdfIn PDF document text
    • https://cdn.sqhk.co/wefegiwezon/cmjhihf/instasaver_photo_video_downloader_for_instagram_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/jelivapizivo/eHsiahg/38758584373.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468572/normal_5feb85fce9710.pdfIn PDF document text
    • https://tololomajaju.weebly.com/uploads/1/3/4/4/134472688/memut.pdfIn PDF document text
    • http://vowitufafuzebil.scienceontheweb.net/92679339774.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482215/normal_6001e19740598.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/398e6358-c8a4-4ac5-856c-b15577c04d87/diduze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53c7596f-6afb-443e-a9c5-f365faa53ba3/wopovuposapipijixesi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d8d823d-acb7-4867-b848-b02243921bb4/how_to_use_garmin_echomap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1036e996-10dc-4966-b512-d7f6b372d7eb/the_trial_franz_kafka_character_analysis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bbf1230-95e8-4ae8-b543-cc1c3cd24d4d/fluval_406_impeller_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f53aea0c-d53b-4157-be8f-6a95b5910d22/gopro_hero3_silver_reset_wifi_password.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_off0001086f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086F 5712 bytes
SHA-256: e03d7beb06fce10958a38bc60fc56f59b6bebce75db80194337c207ed74974a5
font_01_sfnt_off00011bdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDB 11012 bytes
SHA-256: c2cc20c98f915beb7907433ef67b0a55ca5768345f9ecdc5a3531b43678f57b7

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