Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5484f7de9d3ecfb…

MALICIOUS

PDF

75.1 KB Created: 2020-12-20 17:05:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: b27c0f53f9d5d0986f9b942576c951dd SHA-1: b94ad6caae3b649ace4c0fefe8a9ba8e1fce5187 SHA-256: a5484f7de9d3ecfb40f398847107c4ba8db67504d4198b3c80dc9cc599d8315d
134 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including PDF_SEO_DISPOSABLE_LINK_FARM and ML_NYX_PDF_MALICIOUS. The embedded URL points to a suspicious domain, and the document body, though heavily obfuscated, suggests a lure related to 'webquest answers'. The ClamAV detection further confirms its malicious nature, classifying it as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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
  • 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://trafffi.ru/strik?utm_term=cell+transport+webquest+answers PDF link annotation
    • https://tadinitalu.weebly.com/uploads/1/3/4/7/134744808/sawezelurezuzul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390052/normal_5f8fadac0a27b.pdfIn PDF document text
    • https://lubutivewem.weebly.com/uploads/1/3/4/8/134881275/5bb913dac4e.pdfIn PDF document text
    • https://sinuxogutit.weebly.com/uploads/1/3/4/5/134505158/7964128.pdfIn PDF document text
    • https://ruwatavefi.weebly.com/uploads/1/3/4/7/134704280/9673db99b5bb9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393044/normal_5fcff6bd105a2.pdfIn PDF document text
    • https://xowogibudul.weebly.com/uploads/1/3/4/4/134446034/647436.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/893688fa-29d9-4e41-8546-08227c9d278f/united_states_constitution_worksheet_answers.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc11858e5c7695ca99cc683/t/5fd18f72871f8c6e5955e9ff/1607569267225/57151036193.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5145da3bf4b14abc40464/t/5fc9672644b6661e4fc3a0cc/1607034663957/wewasuzuwukuredofokuzavu.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc28f8b40f1034a5cb380cb/t/5fd1f721ac13f65f66181411/1607595809779/blue_heeler_pitbull_mix_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68779adc-2d6c-4ba4-b6d6-fd5c5f402cf4/seruf.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdc79b839866a15ab3def02/t/5fdc9b4c398d112f3d79ee49/1608293197292/carson-_dellosa_cd-_4301_answer_key.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdfed8e6d49a06bb5766bf/1606287081841/list_of_likes_and_dislikes_in_a_relationship.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fce45288eda244dc4acbbd2/t/5fd71e18df2f0204c24f1a11/1607933465664/bluetooth_headphones_for_android_tv.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9FF 6740 bytes
SHA-256: 63918f0495d5863976c8752c90d95c56f1c073747ef567a031544105186753d7
font_01_sfnt_off0000dad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD7 5028 bytes
SHA-256: 2d3bd080dc9d384fbcc0e77da07d0f04dbf82775a68c62be2c359f4e79bfbd9f
font_02_sfnt_off0000ec0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0A 10720 bytes
SHA-256: 5192453cec299eff96102c7fc1ab7d04b5b6eaecc0a1e73b1169badf6869fddf
font_03_sfnt_off00011090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11090 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3