Malicious PDF — malware analysis report

Static analysis result for SHA-256 52493ef77fc293bd…

MALICIOUS

PDF

82.3 KB Created: 2020-12-25 18:47:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: ece9fb43cfd9f9409e85d099ab0232a3 SHA-1: 94b54705cb780923e5e5ae1fee81843d22bd7bc6 SHA-256: 52493ef77fc293bd4e66689ecf530d45f24a1a772300216cdbbd839f3b4d21cd
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. One prominent external URI, 'https://traffine.ru/strik?utm_term=herpes+simplex+encephalitis+mri', is flagged as suspicious. ClamAV also detected this file as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0', indicating a phishing or trojanized document. The presence of embedded JavaScript, though not fully detailed, further supports malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://traffine.ru/strik?utm_term=herpes+simplex+encephalitis+mri PDF link annotation
    • https://rotedovifiwi.weebly.com/uploads/1/3/4/8/134846651/281a932ea4b.pdfIn PDF document text
    • https://sufudoni.weebly.com/uploads/1/3/4/8/134853368/0f613875b905f.pdfIn PDF document text
    • https://cdn.sqhk.co/pupevadojas/jhTgeic/street_slam_dunk_3on3_basketball_games.pdfIn PDF document text
    • https://vebaruroximowut.weebly.com/uploads/1/3/4/3/134342498/71f29d10139515a.pdfIn PDF document text
    • https://cdn.sqhk.co/naketego/fijCvgd/mobogenabet.pdfIn PDF document text
    • https://petizigosi.weebly.com/uploads/1/3/4/9/134903326/lagar-tawudusozokir.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/arrl_handbook_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/biluvuwuzolomebowewifi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92bb0965-e7cc-44fb-9434-eff1580f1019/minnesota_property_ownership_records.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/313b916a-99ad-486d-a896-d3a38a3f6240/9249068444.pdfIn PDF document text
    • https://s3.amazonaws.com/mokixetat/power_pop_bubbles_game.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2464f1f-1b8d-4a3f-9ac1-137efe720cff/17926166680.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c9e10e1-226f-4f7a-8abf-eb407a2dbd50/north_korea_meme_generator.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_off000105fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FC 5200 bytes
SHA-256: b74341de6eee6ce3d0ffee7734ef6c6dcc15b8e0d88362dd23ba04a4f9547641
font_01_sfnt_off00011781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11781 10672 bytes
SHA-256: ea5761ae72acf96a6968d6df4ef05416d0e272a45b1ab4a06a92f27e38e12652

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