Malicious PDF — malware analysis report

Static analysis result for SHA-256 256fcd88f1eaa9c5…

MALICIOUS

PDF

67.3 KB Created: 2021-05-15 14:12:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: fd5f7d9d5a1374927b395e989e017f9b SHA-1: 0397fa20766cf556944f63e141a5f4230e1f922b SHA-256: 256fcd88f1eaa9c59d078448ce069f17d806e05debaadf9ab0a8e41757b1a8b0
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with a prominent one leading to 'lozipotod.ru', suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains references to 'Swann security system customer service' and 'wkhtmltopdf', indicating a lure to impersonate a legitimate service. The presence of external URIs and link farm heuristics further supports a malicious intent to redirect users to untrusted sites.

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://lozipotod.ru/strik?utm_term=swann+security+system+customer+service PDF link annotation
    • http://pay-order.info/hc-_sr04_schematicuj6lw.pdfIn PDF document text
    • https://cdn.sqhk.co/lisakopew/KHf7ii2/rise_up_like_lazarus_song_lyrics.pdfIn PDF document text
    • http://tophomework.space/nidifd22ps.pdfIn PDF document text
    • http://mavitrade.com/android_studio_logcat_dead85elw.pdfIn PDF document text
    • https://cdn.sqhk.co/vameduvide/gfxieDW/bituminous_paint_data_sheet.pdfIn PDF document text
    • https://cdn.sqhk.co/putevupumaf/lmiaFyH/jujujumogate.pdfIn PDF document text
    • http://idslim-italia.site/gunuravumogutufiwatitijird2lvf.pdfIn PDF document text
    • http://idealslimitalia-ufficiale.site/bixodabiwotekaboxaxolufqppz.pdfIn PDF document text
    • https://cdn.sqhk.co/xurajalijok/dgeAjeq/summoners_war_codes_ios_2020_march.pdfIn PDF document text
    • http://fumigatoff.online/50424428976lszpk.pdfIn PDF document text
    • https://cdn.sqhk.co/guledijuxi/gWhfgdj/roxirevol.pdfIn PDF document text
    • http://counterman.ru/is_tom_sawyer_hard_to_read9jki8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a38c59f5-62af-4f0f-aa18-63f10a50b42b/easy_piano_songs_to_play_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98a07a80-20e8-4eae-a611-9dec53699f2d/48781745359.pdfIn PDF document text
    • https://6ce95562-7558-49ee-a7b0-b3003db3b0e9.filesusr.com/ugd/d13e1f_c1d03d71f4b14da38d1f65e8789adb3e.pdf?index=trueIn PDF document text
    • https://64b67c6e-fbbd-4787-add8-9ed3e274c95c.filesusr.com/ugd/eb6612_72633e372e8747b8a579ecc4c3d49839.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f918590-5546-49b9-b203-24f457e03a72/what_are_the_4_management_skills.pdfIn PDF document text
    • https://36c7e617-1221-4173-b726-d5bce2878801.filesusr.com/ugd/610d21_76782bed26e64214affd43bc0ac315ca.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/274f8d61-2310-4cdf-ac66-241f5f3f1d3f/88528760017.pdfIn PDF document text
    • https://171e2b11-24ea-4535-acac-f971ec821c4b.filesusr.com/ugd/a07927_cbf2e4a2e53a42ac8319b117abe7f2f3.pdf?index=trueIn 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_off0000cc98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC98 5272 bytes
SHA-256: 33b6215cb9169c94f26b259e959c046819c3592685e43129f4a2e4bcacd96dc0
font_01_sfnt_off0000de84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE84 9792 bytes
SHA-256: aa7ceeca015a93202ff2186b1363a01c97ec6a3e4763d55eedd5e742e5e33817

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