Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f90fb97ba873cbf…

MALICIOUS

PDF

105.9 KB Created: 2021-04-02 17:27:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 664251e14c6bcefd0f364230c763fd61 SHA-1: 0bb03a5b116569cdf4ab4f198d491e413219b2d9 SHA-256: 7f90fb97ba873cbfb8f080c728ad0afe696c3f45932c7a1143b7b13420fec21b
206 Risk Score

Malware Insights

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

The PDF file contains a mass of external links, many pointing to disposable domains, indicating a link farm or spam distribution tactic. The document body, though heavily obfuscated, contains text related to 'energy conservation' and 'wkhtmltopdf', suggesting a lure to disguise the malicious intent. The presence of PDF-specific heuristics like 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly supports this attack pattern. No scripts were extracted, but the overall structure and heuristics point towards a phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://zajinet.ru/strik?utm_term=importance+of+energy+conservation PDF link annotation
    • http://robot3.site/78302152838eiys0.pdfIn PDF document text
    • https://vatunumorese.weebly.com/uploads/1/3/4/8/134866462/1528094.pdfIn PDF document text
    • http://003-center.ru/jabajiresulivutemazmbwgu.pdfIn PDF document text
    • http://edarudost.online/634320707497d4nn.pdfIn PDF document text
    • http://jarosabaratop.22web.org/why_does_my_bose_speaker_keep_shutting_off.pdfIn PDF document text
    • http://solapp.xyz/marvel_comics_characters_villainscsem7.pdfIn PDF document text
    • http://azalea.store/nazojukedelafuvazorvk.pdfIn PDF document text
    • http://xujilutobidiko.iblogger.org/21117535229.pdfIn PDF document text
    • https://zaketedojerobi.weebly.com/uploads/1/3/6/0/136023974/9237712.pdfIn PDF document text
    • https://vomedizi.weebly.com/uploads/1/3/5/3/135312409/zanozet.pdfIn PDF document text
    • https://derodaju.weebly.com/uploads/1/3/1/6/131606282/a46d9f98c77.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://besigaku.epizy.com/how_to_make_your_own_jelly_roll_strips.pdfIn PDF document text
    • https://2eeb51df-07ba-4372-80d9-1ef4646fc7f7.filesusr.com/ugd/6af210_8a24288b6739437dab34a813f0b4c14e.pdf?index=trueIn PDF document text
    • https://f608bf75-187c-4b28-9621-af925c05c2b6.filesusr.com/ugd/05e3ad_b116fd01e7564f5d94e23ccdc81dc3b1.pdf?index=trueIn PDF document text
    • https://5e024257-ca51-40df-b6b5-a3104c7b7124.filesusr.com/ugd/97368a_c7146018061348e399a361dae0d6d349.pdf?index=trueIn PDF document text
    • http://zoletiwosi.rf.gd/botanical_illustration.pdfIn PDF document text
    • https://2d130471-2a64-48ba-87cf-8f1e86c6acad.filesusr.com/ugd/9c43ec_3d8914a0d2e64fea8df341e77a83f1c8.pdf?index=trueIn PDF document text
    • http://lisunamubeso.epizy.com/free_software_solution_attendance_management.pdfIn PDF document text
    • https://44dd6259-7513-41c7-b2f1-b2b1fc385d2e.filesusr.com/ugd/63022f_a6c04aece82f486ea3af918f0e2749f5.pdf?index=trueIn PDF document text
    • http://sogefotatuledis.epizy.com/capture_the_flag_game.pdfIn PDF document text
    • http://bomigezi.epizy.com/intersecting_chords_in_a_circle_worksheet.pdfIn PDF document text
    • http://zebikijixikemas.rf.gd/fugepigibopisabewale.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14147 9548 bytes
SHA-256: 0d260e52f06223ff40507729a077e398cf9c9cba5be8175a15f554b78acf5b93
font_01_sfnt_off000160fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160FA 5404 bytes
SHA-256: d34dc8ff89a8069f64b79fbdd0227fa6e26403e1dc82fb24329678eda986020d
font_02_sfnt_off00017359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17359 11400 bytes
SHA-256: 133c43b807a585b9c939540992a9ff000acb5e3ad615ff04f7a38c1cee677159

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