Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f8800343b450d41…

MALICIOUS

PDF

77.1 KB Created: 2021-03-27 22:12:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 6cd0ab3befad038fa7564a95daf86d64 SHA-1: 0a76a3eaf6d23cd46d20ec1ec5db9097c98172de SHA-256: 4f8800343b450d415b24d496fe29ca87115367e1692598b2eb022d761bafd750
154 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a high number of external URIs, many of which point to disposable hosting or suspicious domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://vilenefex.ru/wix?keyword=information+technology+worksheets+for+grade+1 PDF link annotation
    • http://boforotaje.mywebcommunity.org/19123789739.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487935/normal_605d994343588.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376870/normal_604244d58799d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366360/normal_5fe2769759f11.pdfIn PDF document text
    • http://wepijafiguwenan.mywebcommunity.org/poker_one_pair_rules.pdfIn PDF document text
    • http://pebifakonek.sportsontheweb.net/63398899184.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373240/normal_60251bcced79d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469630/normal_5fdecabf67a6f.pdfIn PDF document text
    • http://gizovivomiz.getenjoyment.net/potipaj.pdfIn PDF document text
    • http://sasegotib.medianewsonline.com/14160816480.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/fd93a88d-50e4-46bd-852e-4f0cd29a49dd/what_would_cause_a_kenmore_dishwasher_not_to_drain.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a004d382-7c26-4d84-b918-55a01cf2d56f/52513145037.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c0fc31a-9572-4ebe-aaee-a0c647cefc14/fire_and_water_ice_temple_game_online.pdfIn PDF document text
    • https://s3.amazonaws.com/tubukeganuji/how_to_manage_your_anger_speech.pdfIn PDF document text
    • https://s3.amazonaws.com/levovod/mofopawaxaxiluton.pdfIn PDF document text
    • https://s3.amazonaws.com/vibasujefir/fractions_worksheets_gcse_maths.pdfIn PDF document text
    • https://s3.amazonaws.com/puretulenuza/big_mouth_and_ugly_girl_character_description.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0760d2c-d7b7-4cf5-91eb-5ed8d5b98f51/sukig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2751fea-d8a1-4a7e-98cc-4f5a370fdda7/how_to_use_the_self_clean_on_my_wolf_oven.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4705487c-4757-4c9d-aceb-f319291ff6d9/how_to_best_listen_to_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d7dec1e-afe7-4cd7-a9f8-ed5b1381f514/98333734895.pdfIn PDF document text
    • http://pisonepegosa.myartsonline.com/47975073646.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a0508de-ea86-4fa2-981b-f5efca7deeee/4560776439.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a691f69-dd04-413f-89e4-317e863f61a3/41202498511.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_off0000ed29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED29 5684 bytes
SHA-256: e92a570f84b4b9651fe65c7685422cbf80209c9ec2c9a3f5d28bf0611c0d2b5a
font_01_sfnt_off00010078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10078 11152 bytes
SHA-256: 6460a7f9ed5f53a0b2f3ae3b1717127f1c66bb67994f2bf1875253aa644aaab3

Open this report in the interactive analyzer, or submit your own file for analysis.