Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff795dd8fdf1b88b…

MALICIOUS

PDF

82.6 KB Created: 2021-03-20 01:37:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 361ee4b20bc22b6a9677c5388cb5d7db SHA-1: d619fef1142c1b9385f08bf4fd2c427defa25587 SHA-256: ff795dd8fdf1b88bfe5c9d411b6aa2a563912edb7ddc91028418f0f05ab8fc0a
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it contains a large number of external links, a common tactic for phishing or SEO spam. The primary URL, https://soxebez.ru/wix?keyword=ho+bieu+chanh, is likely used to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links suggest an intent to drive users to compromised or malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/wix?keyword=ho+bieu+chanh
    • http://hhizmet.com/guroripakipodusepiy8ul2.pdf
    • http://siondez.ru/holt_life_science_textbookux5fp.pdf
    • http://mobile-media.moscow/lobijunx5cj.pdf
    • http://tuimag.ru/romeo_and_juliet_act_5_scene_1_and_2_questions_and_answersopri3.pdf
    • http://praktika-ingenieur.com/60203050811garku.pdf
    • http://pemufosapakem.mypressonline.com/48896814112.pdf
    • http://abouts.space/english_to_thai_alphabet_translation3yw9e.pdf
    • http://fkpravo.ru/105433843611payd.pdf
    • http://raisinsapp.pro/hp_officejet_pro_8500a_print_quality_problemsg78ol.pdf
    • http://foselosen.sportsontheweb.net/migivolaliwitojeno.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vibupozikijebi.rf.gd/world_stock_markets_open_times.pdf
    • https://s3.amazonaws.com/sazomo/gevamixiside.pdf
    • https://s3.amazonaws.com/pewebopufupe/lurakuxexazawemijuwokovem.pdf
    • http://bofetotazefonuv.epizy.com/83876041925.pdf
    • https://s3.amazonaws.com/tidigudetefumof/225081369.pdf
    • https://s3.amazonaws.com/vukumesoj/hd_love_wallpapers_1080p_for_android_mobile.pdf
    • https://c827806f-f9bf-4fd3-a4ce-e487c020fa79.filesusr.com/ugd/6fd45c_f6c368242e9c4a4eb94e075ba33ae131.pdf?index=true
    • http://levegukesiwus.rf.gd/regulation_of_carbohydrate_metabolism.pdf
    • http://galexuduxegi.epizy.com/bumavog.pdf
    • http://zilisidojaze.myartsonline.com/ritug.pdf
    • https://s3.amazonaws.com/gurafoga/89142330959.pdf
    • https://db6a684c-bd73-4a61-997a-17040cc1d896.filesusr.com/ugd/bbbb20_b6a90c3662164e76a7764d807439c2b6.pdf?index=true
    • https://de99934f-f465-4d69-af5e-14f317c0a7c6.filesusr.com/ugd/4fea5c_3f18a6766d944893bb247d54b3f8200c.pdf?index=true
    • 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_off0000f9bf.bin
332129547e12984c9d934ffda490ec43b2507bc01f06e253ce78580faeb46a57		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BF 4684 bytes
font_01_sfnt_off000109ab.bin
bbfaed7d2bdd336b8c04f345a65b17bb5b66008ac8756c1b67352eab17b16e2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109AB 23160 bytes

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