Malicious PDF — malware analysis report

Static analysis result for SHA-256 66388807957c75c4…

MALICIOUS

PDF

80.8 KB Created: 2021-01-21 14:08:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: b432e92a13184d01eb544e6adb1b2208 SHA-1: e20f74976d176a68be11cd9e75cb64fbc2c52994 SHA-256: 66388807957c75c4966cef91eaf55c3d094d6a6174749fc7c450070907139efe
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external URIs, many pointing to disposable hosting and employing UTM parameters, strongly suggests a link farm or phishing lure. The ML classifier also indicated a high probability of maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing attempt or a distribution point for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafftec.ru/aws?utm_term=text+to+speech+indian+voice+free PDF link annotation
    • https://popugimamad.weebly.com/uploads/1/3/0/7/130775647/kodatad.pdfIn PDF document text
    • https://cdn.sqhk.co/kafexobesa/4cBA2hc/text_twist_online_on_wordplay.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453914/normal_5fdead2aeae3d.pdfIn PDF document text
    • https://site-1208698.mozfiles.com/files/1208698/verification_of_bernoulli_theorem_lab_report.pdfIn PDF document text
    • https://tijirurilulade.weebly.com/uploads/1/3/4/3/134312421/ada258ff61.pdfIn PDF document text
    • https://cdn.sqhk.co/gasawivu/bjhnjj5/air_traffic_control_tower_minecraft.pdfIn PDF document text
    • https://cdn.sqhk.co/befozaxulot/ehaOJzT/racing_car_driving_simulator.pdfIn PDF document text
    • https://pifavakibapel.weebly.com/uploads/1/3/0/8/130814246/kovuzuvasu.pdfIn PDF document text
    • https://site-1184137.mozfiles.com/files/1184137/butterfly_live_hd_wallpaper.pdfIn PDF document text
    • https://site-1202889.mozfiles.com/files/1202889/futura_std_bold_font.pdfIn PDF document text
    • https://jimurapixow.weebly.com/uploads/1/3/5/3/135399705/falatezo.pdfIn PDF document text
    • https://cdn.sqhk.co/sojowidaz/Bgeldid/jiffy_lube_portland_tx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://govatojajij.epizy.com/extinct_endangered_animals_information.pdfIn PDF document text
    • https://s3.amazonaws.com/ronenitevodo/zakovedudirafiwos.pdfIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/building_information_modeling_salary.pdfIn PDF document text
    • https://s3.amazonaws.com/savifin/2576733072.pdfIn PDF document text
    • https://s3.amazonaws.com/podawakumepewez/40786053009.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_off0000fe27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE27 5288 bytes
SHA-256: 1ec715fde3a4a9d722906473e40c5de6bd359c9c21bef48c2190ecdcd378f79b
font_01_sfnt_off0001102a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1102A 11060 bytes
SHA-256: c77aac540783379b6146b8dd3319f4dc72575020c818a9f32f2acf837e1657ad

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