Malicious PDF — malware analysis report

Static analysis result for SHA-256 17fa10469fb8ec4b…

MALICIOUS

PDF

74.3 KB Created: 2021-03-03 06:00:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 80a1a84625e448546559eacffeb6c01d SHA-1: 28c61e2dba92b54eda72d509d9d58ffd5b730c5b SHA-256: 17fa10469fb8ec4b8ae9c331268821772a3bb724b5b8255f2f4249ff24604666
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious content. The presence of numerous external URIs, many hosted on disposable domains or link farms, suggests a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains text related to academic literature reviews, likely serving as a lure to direct users to malicious sites like dugedepap.ru.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dugedepap.ru/strik?utm_term=how+to+start+a+literature+review+example PDF link annotation
    • http://makamar.online/how_to_use_lg_steam_washerrh4ju.pdfIn PDF document text
    • http://movawizaxaxato.mywebcommunity.org/sekiselekegizepi.pdfIn PDF document text
    • https://cdn.sqhk.co/luwibajik/bAjgNRd/bendy_mod_apk_android_1_talking_tom.pdfIn PDF document text
    • https://figiroxofidun.weebly.com/uploads/1/3/0/7/130740151/f839888ef9.pdfIn PDF document text
    • https://patobusogeziwe.weebly.com/uploads/1/3/4/0/134096506/9755634.pdfIn PDF document text
    • https://rajopolaxobi.weebly.com/uploads/1/3/1/4/131406270/9394007.pdfIn PDF document text
    • http://sosiwawivijomo.scienceontheweb.net/nuvekenetaf.pdfIn PDF document text
    • https://verevivomilob.weebly.com/uploads/1/3/0/7/130738769/9176257.pdfIn PDF document text
    • https://cdn.sqhk.co/busumodofu/gdjgjaz/65730290990.pdfIn PDF document text
    • https://cdn.sqhk.co/xezojutatow/fji3PNx/92615337191.pdfIn PDF document text
    • http://gatowixipeba.mywebcommunity.org/66365816766.pdfIn PDF document text
    • http://xawamiwupajev.mygamesonline.org/how_to_draw_a_equilateral_triangle_using_a_compass.pdfIn PDF document text
    • http://stnold.com/skred_messenger_download0weqo.pdfIn PDF document text
    • https://jedebesoza.weebly.com/uploads/1/3/4/7/134739829/zewekakirurubojez.pdfIn PDF document text
    • http://3gusevshop.website/529247068022vxs6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wobanunep.myartsonline.com/how_to_use_a_commercial_electric_digital_multimeter_mas830b.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_off0000e82b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82B 5144 bytes
SHA-256: ddc1592c1cffdc079fcb5c3c5a6c61351706a68af9377bb3f753b7e351ead743
font_01_sfnt_off0000f9a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A9 10104 bytes
SHA-256: ad3bbea4d163bc9341586aae061fc55564d387a3ccc27667cfcc50009528e6a8

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