Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a754da20d7489d0…

MALICIOUS

PDF

75.5 KB Created: 2021-02-17 07:42:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 2c19a1a4e62b53d37c52f181e71cdb5d SHA-1: c0d905a8e1a11fc24af526ddd32d380fd1301a8e SHA-256: 7a754da20d7489d08eb868cc5140674d781f9bc9615a892d4a42d9d9bb964b0c
222 Risk Score

Malware Insights

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

This PDF file was flagged by multiple critical heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains a large number of embedded links, many pointing to redirectors and potentially hosting further malicious content, suggesting a phishing or malware distribution scheme. The presence of a 'download button' lure further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://yafferge.ru/wix?keyword=ruki+the+gazette+age In PDF document text
    • https://cdn.sqhk.co/zujumatatub/ihLfMgf/gasasesekumeveb.pdfIn PDF document text
    • https://cdn.sqhk.co/sebutarukaw/jbidXn5/sufogodexikinazelulawuzu.pdfIn PDF document text
    • https://cdn.sqhk.co/molipigi/ijgfM9e/among_us_imposter_mod_apk_android.pdfIn PDF document text
    • https://cdn.sqhk.co/disumuneriva/btgdjfi/90800955966.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452173/normal_5feec523121ee.pdfIn PDF document text
    • https://cdn.sqhk.co/kisereta/ghgJVL8/49727825720.pdfIn PDF document text
    • https://cdn.sqhk.co/jopubelo/k8IhjCL/fallout_shelter_cheats_ps4.pdfIn PDF document text
    • https://cdn.sqhk.co/logubaxe/Cwdgf2w/44042180476.pdfIn PDF document text
    • https://jukamonasob.weebly.com/uploads/1/3/0/7/130740128/navejivibuganigovup.pdfIn PDF document text
    • https://cdn.sqhk.co/jawafurovif/u1FjatK/lekat.pdfIn PDF document text
    • https://cdn.sqhk.co/foropogajag/gi1heii/dollhouse_trap_remix.pdfIn PDF document text
    • https://narepugajud.weebly.com/uploads/1/3/0/7/130775299/9779434.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469375/normal_5fe713a06e397.pdfIn PDF document text
    • https://cdn.sqhk.co/gomurabog/jXKKjiW/pixel_gun_3d_online_generator_free.pdfIn PDF document text
    • https://cdn.sqhk.co/bamazaludez/Zjjhbgc/stock_markets_in_stock_market_simulator_app.pdfIn PDF document text
    • https://cdn.sqhk.co/bitaxukezor/1UjgQ20/alita_battle_angel_movie_review.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000eac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC6 4760 bytes
SHA-256: 146093b9d2af6e6ee289c40e30b46dda0824bd237b71b428eeba71e5d21766a7
font_01_sfnt_off0000fb07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB07 11900 bytes
SHA-256: 65d0a2327d159487d8fc7a2c91a1d97c06f59dc6865da13b529a45bbf75f2e42

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