Malicious PDF — malware analysis report

Static analysis result for SHA-256 a82a168642c97a8a…

MALICIOUS

PDF

89.4 KB Created: 2021-04-08 03:26:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bdc93b9a87cdee70164463ade790087b SHA-1: 32fdb81da3c7b182aefbe0874b6330e11381288a SHA-256: a82a168642c97a8a86156312942163f849ff6073fdc7feec26ef51b725720591
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to unknown or potentially malicious domains, indicating a link farm or SEO spamming operation. ClamAV and ML classifiers also flagged this file as malicious, specifically as a phishing trojan. The presence of embedded URLs and the overall structure strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/strik?utm_term=m-audio+firewire+410+digital+recording+interface
    • http://microbestdigitalmeter.xyz/letter_of_intent_artist_residency_samplex4xre.pdf
    • https://wumibatolazonik.weebly.com/uploads/1/3/1/4/131437616/padodatogel.pdf
    • http://duplicwcnj.space/ants_in_carsiqau.pdf
    • http://arendaavto.taxi/wulidebojetofamuelba.pdf
    • http://rmk4sale.xyz/newest_call_of_duty_ps4_gamesj4f2t.pdf
    • https://zufakuka.weebly.com/uploads/1/3/4/3/134343409/6bf28e.pdf
    • http://ezfix.asia/95182004443ufmwq.pdf
    • http://madamzero.com/iworld_mega_pulse_bluetooth_earbuds_manualryu7c.pdf
    • http://alteramaks.world/14371164910yrhkk.pdf
    • http://liketime.fun/69874544445wgmn1.pdf
    • http://tophomework.space/hunter_douglas_motorized_blinds_replacing_batteries3oe75.pdf
    • http://stebsmeh.space/cars_3_tamil_movie_hd8zbru.pdf
    • http://grandov.pro/how_to_work_a_room_chapter_1_summary7ulmn.pdf
    • http://itanto.space/twisted_snow_white_storyw3hiu.pdf
    • https://zeloruzo.weebly.com/uploads/1/3/5/3/135349371/3846962.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jaxesabi/goxip.pdf
    • https://s3.amazonaws.com/mibiwivanetuj/guided_backcountry_skiing_tahoe.pdf
    • https://s3.amazonaws.com/fulosobezur/minority_report_lyrics_jay_z.pdf
    • https://s3.amazonaws.com/tumuzu/gidivifasifuranus.pdf
    • https://s3.amazonaws.com/gonima/por_que_es_importante_el_uso_del_diccionario.pdf
    • https://s3.amazonaws.com/kezemiradigu/rain_dial_hardie_rd_600.pdf
    • https://s3.amazonaws.com/muxozuvalubi/hbr_data_analytics_basics_for_managers.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_off00011ee2.bin
16ea219c48074460221c045c7ce0c5f5b3bdb966efe2804037e5decb83985002		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE2 5424 bytes
font_01_sfnt_off00013195.bin
92b1e5cddd55ed9783035a7eeed8e43d0f35f951fa19cf780c550fb63af5b684		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13195 11148 bytes

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