Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6aa4b764cd60278…

MALICIOUS

PDF

86.8 KB Created: 2021-03-20 05:55:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 770b66deb4dd094a036b363ba71fee58 SHA-1: 26b2f057d17b9bfb7230c1337ffe502953604a9d SHA-256: b6aa4b764cd6027822adfbd44d823410f6043138b0cbac60faf17c80c78ccc64
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to redirect users to potentially harmful websites. ClamAV also detected the file as 'Pdf.Phishing.Trojan'. The presence of embedded URLs and the overall structure point towards a phishing or malicious redirection attack, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/wix?keyword=webelos+badge+placement+on+blue+shirt
    • https://cdn.sqhk.co/midubevine/Fhijgb3/ps4_remote_play_controller_not_working_android.pdf
    • http://zixudisomiv.22web.org/how_to_clean_the_kenmore_elite_washer.pdf
    • http://vizionsmc.net/jefidixemakisijiwufidamcw6b.pdf
    • https://cdn.sqhk.co/sebudesusoj/v1rMidr/dancing_on_my_own_chords_piano_easy.pdf
    • https://cdn.sqhk.co/toxinize/jjjVia7/uefa_champions_league_2019_20_groups.pdf
    • https://cdn.sqhk.co/dogojaseziwo/Pjedgja/lafupo.pdf
    • http://wide-mean.top/32272017997nczaa.pdf
    • https://cdn.sqhk.co/fezivabuja/EhdXpif/black_hair_salons_near_me_open_on_sunday.pdf
    • http://giftcard-sale.store/i_am_that_man_brooks_and_dunnpro4e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/setaxilitozuko/90262384948.pdf
    • https://s3.amazonaws.com/zopenave/27903047736.pdf
    • https://s3.amazonaws.com/memobofilenabon/have_something_done_exercises_with_answers.pdf
    • https://e26976e3-f089-44cc-a2a6-54bcc6cae308.filesusr.com/ugd/0df15e_239034c32b924a0786053315fa4289bc.pdf?index=true
    • https://s3.amazonaws.com/nowokil/roman_catholic_tamil_bible_app.pdf
    • https://f635e5d9-31b1-4f19-b758-7a623be10181.filesusr.com/ugd/6cf0f5_1e446b79ceeb4b70a671eeedae509352.pdf?index=true
    • http://rakejobik.epizy.com/84309863202.pdf
    • https://6e678f60-abc6-404c-883a-cd1729fdffee.filesusr.com/ugd/e4291f_6495ed2ddf7c4b9a83d6588d5fe147c8.pdf?index=true
    • https://9e77dbea-16d6-438e-9859-4a68c5388828.filesusr.com/ugd/3225da_d4987b44cc484491a2441f47dc62c8f7.pdf?index=true
    • http://bepunemafozo.epizy.com/49910030340.pdf
    • https://6f4861c6-cdf0-4a5f-ba2d-f9c5e5bfbee6.filesusr.com/ugd/77941b_cac5a0ae1a36428da2a2a609a830b81d.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_off00011330.bin
7bcd50ab906b621dfb75dcfc591af0e2502f17360a3cc2c7a5697be325fbf8a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11330 5640 bytes
font_01_sfnt_off00012637.bin
6b47507c91e3b036f9d8e081aba0bb912bcae31aaebf8d42127122fa0155b0fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12637 11820 bytes

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