Malicious PDF — malware analysis report

Static analysis result for SHA-256 93d8a2e7ebc24477…

MALICIOUS

PDF

71.3 KB Created: 2021-02-19 02:36:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 6be64829b61fcd3481dc5c1b4f5737d5 SHA-1: 5b19dc51abea3df393241d1f94e90b16d0b12d5b SHA-256: 93d8a2e7ebc2447733a25d5922d9a39bd444a1f9153d71b4b96d7fc1675379f5
176 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF link farm' and another flagging it as a phishing lure. The document body, though heavily obfuscated, contains text related to contacting the post office, suggesting a pretext for the malicious links. The presence of embedded JavaScript, indicated by the T1059.007 technique, suggests the potential for further malicious actions such as downloading additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://seumenha.ru/aws?utm_term=how+to+contact+the+post+office PDF link annotation
    • https://cdn.sqhk.co/wovenebi/oxiddic/gidixozidudafevuzogidis.pdfIn PDF document text
    • http://bu-markett.com/cube_world_download_2016zf2xs.pdfIn PDF document text
    • http://cg-designer.xyz/riverside_driving_range_san_antonio9l3qr.pdfIn PDF document text
    • https://gudesikoz.weebly.com/uploads/1/3/4/3/134374550/5622943.pdfIn PDF document text
    • http://arm-watch1.club/13153261103q33gm.pdfIn PDF document text
    • http://meetsalle.xyz/sujil9g4hq.pdfIn PDF document text
    • https://xokaxopo.weebly.com/uploads/1/3/2/3/132302824/jarekenud_kubodolot_kujudusuwo_gawokazilelo.pdfIn PDF document text
    • http://eeuuurrrrr.space/brawl_stars_mod_apk_16._176ztrr0.pdfIn PDF document text
    • https://xelasukozulete.weebly.com/uploads/1/3/2/6/132681542/dosutetoluketa.pdfIn PDF document text
    • http://nikaold.site/english_calligraphy_worksheet4x8pw.pdfIn PDF document text
    • https://wedemewimobuxet.weebly.com/uploads/1/3/4/3/134309086/memotopu_texegot_wirijoni_rabaxugug.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/nopomewegobij/cannot_copy_sheet_in_excel_2016.pdfIn PDF document text
    • https://s3.amazonaws.com/wulagisi/95928659792.pdfIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/assateague_island_visitors_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/vizegemawokaxe/21311633628.pdfIn PDF document text
    • https://s3.amazonaws.com/sizabo/86009222304.pdfIn PDF document text
    • https://s3.amazonaws.com/lekelepowo/cisco_aci_simulator_ordering_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/kujesulad/fishing_guides_san_juan_puerto_rico.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_off0000dae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE3 5028 bytes
SHA-256: 9ec3d766467ae2259ed35d17eaad0142d124c9a47eaad58af36142abe6ae7029
font_01_sfnt_off0000ec16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC16 10612 bytes
SHA-256: 06610887d63c4f737dbb460b05bafe1a57d822b6feec2818f4cbb82b825bf0f0

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