Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0fd35a96d16d3c1…

MALICIOUS

PDF

75.4 KB Created: 2021-03-25 02:59:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e050d18b1c59f7b137bb1998cb199da6 SHA-1: d71618e52a8b0f7e89db946548b8e081922225bc SHA-256: a0fd35a96d16d3c176bc3ee03fa2168610bf616c2fc8497c1101ab82fdc07fd9
244 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, and one specifically identified as a malicious redirector. The document body, though heavily obfuscated, suggests a lure related to 'multiplication worksheets double digit'. The presence of numerous links and the malicious redirector indicate an attempt to lead users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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.
  • 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=multiplication+worksheets+double+digit In PDF document text
    • http://zowogusatutojus.mywebcommunity.org/doworojapatu.pdfIn PDF document text
    • https://cdn.sqhk.co/patagarinixa/3BjbheL/6120408431.pdfIn PDF document text
    • https://jateredadiwez.weebly.com/uploads/1/3/1/6/131606262/jokekopepufunuvob.pdfIn PDF document text
    • https://nesipemuwazona.weebly.com/uploads/1/3/4/8/134881126/6034338.pdfIn PDF document text
    • http://igcopyrightverify.com/insinkerator_badger_1_owners_manualywxrj.pdfIn PDF document text
    • https://selemuja.weebly.com/uploads/1/3/4/8/134893326/xesuvokilape-taguwomozudil-lisav-mepat.pdfIn PDF document text
    • http://zugasanuko.getenjoyment.net/bearing_number.pdfIn PDF document text
    • https://wivupenoremew.weebly.com/uploads/1/3/0/7/130775018/3246731.pdfIn PDF document text
    • http://nijewogifuzazi.mypressonline.com/2nd_great_awakening_apush_definition.pdfIn PDF document text
    • https://tajurasexir.weebly.com/uploads/1/3/1/6/131606020/pizoririgodex-jamusu-wuwezokeves.pdfIn PDF document text
    • http://xazupadapafow.mypressonline.com/bsc_nautical_science_syllabus.pdfIn PDF document text
    • http://thrivewebs.com/21748644633sdoq0.pdfIn PDF document text
    • https://suzitarux.weebly.com/uploads/1/3/4/6/134683800/towarir_sebasamokuvupan.pdfIn PDF document text
    • https://vapesokon.weebly.com/uploads/1/3/4/3/134329795/2b0b0185e3e7.pdfIn PDF document text
    • https://zademufexek.weebly.com/uploads/1/3/4/7/134765537/3098a8edce2de0f.pdfIn PDF document text
    • https://dagigofeno.weebly.com/uploads/1/3/4/8/134887245/nazerunukazufade.pdfIn PDF document text
    • http://ditoterelutas.sportsontheweb.net/17588528589.pdfIn PDF document text
    • https://levevuwakute.weebly.com/uploads/1/3/4/9/134904524/pagateru.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/PibLjcP/clothes_worksheets_clipart.pdfIn PDF document text
    • http://springtea.space/vipojusazobinilafibuee5lx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://todifisafi.atwebpages.com/bulelimaraximar.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_off0000e90a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90A 5636 bytes
SHA-256: 4c04b3399fa0c12cfd6c99f32f56c55e1fa8c41320f887b847e15173d019679c
font_01_sfnt_off0000fc43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC43 10584 bytes
SHA-256: 400dc09c0563a74dbea00ea87a7b0adc2b2506ba6604d5cc7dc4c712e20dd466