Malicious PDF — malware analysis report

Static analysis result for SHA-256 91eff81f098fd1f6…

MALICIOUS

PDF

68.3 KB Created: 2021-03-17 20:41:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b834b5b5815eea3724c7cc9dbaa0073d SHA-1: 91cc89f9a5c80abb18180d5252dffcd23d8188e9 SHA-256: 91eff81f098fd1f613081f673f27ac51365cd965035894b96c19d60402e30cda
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs pointing to suspicious domains, indicating an attempt to redirect users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The presence of external URIs and a link farm heuristic further supports the conclusion that this document is designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://resalured.ru/wix?keyword=hobo+the+game+7+unblocked
    • https://cdn.sqhk.co/pimidima/iiCy1ib/wisufujepazivadufelerulo.pdf
    • https://cdn.sqhk.co/xokekekav/hbhdhgf/top_hits_today_philippines_spotify.pdf
    • http://werenntaq.online/jamaica_images_clip_art_christmassylb8.pdf
    • http://klyshsheff.xyz/alisensor_shaft_laser_manual8okhk.pdf
    • http://7gusevshop.website/lagawelu_jab_lipistic_mp3_song_downloadz53tz.pdf
    • http://1xbet-regi.site/how_to_find_the_missing_length_of_a_triangle_using_trigonometrydlj7j.pdf
    • http://ramedefinu.getenjoyment.net/total_alkalinity_of_water.pdf
    • http://fukerijinexin.mygamesonline.org/lujidamirozosedowud.pdf
    • http://complerbnp.com/beep_sound_effect_mp47tpsf.pdf
    • https://cdn.sqhk.co/vonezositixi/xhgfhej/83765258623.pdf
    • http://topstudy.fun/byte_array_to_string_conversion_in_androidpp6yj.pdf
    • http://novijixonusasu.mywebcommunity.org/bhaktisiddhanta_sarasvati_books.pdf
    • http://ipai.online/vugixe1lf2n.pdf
    • http://bit7.top/hp_elitebook_2570p_datasheetc76vo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d5da409d-d32f-4f85-8541-771ef185717b/amazon_prime_junie_b_jones_books.pdf
    • https://uploads.strikinglycdn.com/files/4cda44a1-a1ad-451b-92fc-01b057128acf/how_to_relight_pilot_light_on_new_furnace.pdf
    • https://uploads.strikinglycdn.com/files/56470c0c-c1f6-457b-b201-dcfd2030bdec/three_types_of_intermolecular_forces_in_order_of_increasing_strength.pdf
    • https://s3.amazonaws.com/julexekubaj/wet_stone_knife_sharpening_guide.pdf
    • https://s3.amazonaws.com/zosevid/68878233136.pdf
    • https://uploads.strikinglycdn.com/files/25e973da-2afe-4ab9-babd-78f384805eca/dd_wrt_router_firmware_update.pdf
    • https://uploads.strikinglycdn.com/files/f416ee16-92ad-4a4b-b54e-ca60e4b1fafa/powerxl_vortex_air_fryer_recipes_chicken_wings.pdf
    • https://s3.amazonaws.com/gavapozalilup/arbys_large_curly_fries_nutrition_facts.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d041.bin
ed434076ab71c41e64853cbb72283ab2a1dba9c71876f47c0b9ae7a742568526		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD041 5324 bytes
font_01_sfnt_off0000e23e.bin
147b1cb78f13a5477beec014692d9a50ea3e6c9d070ac4a48e3dabc5d56c5df0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE23E 10028 bytes

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