Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c9907a036a24583…

MALICIOUS

PDF

75.8 KB Created: 2021-06-10 03:25:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b916825be63c8e410b4c522eb9e34c43 SHA-1: 90dc86ff40e3bb2a98d170f6a5477c50fbd17dfb SHA-256: 5c9907a036a2458354c1b88042f019f638dec331ead5a3cf4eb8bb14fc945cae
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://allytemp.ru/pbw?utm_term=black+ppt+templates+free+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4452607/normal_5fe25bf0c678b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403814/normal_5fe3c3d416c7e.pdfIn PDF document text
    • https://xeforosoxipu.weebly.com/uploads/1/3/4/9/134900432/3f3ebb373.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475730/normal_6049b5db2193b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368222/normal_5ff614fa99766.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368751/normal_6036aefab70d8.pdfIn PDF document text
    • https://girowotejetut.weebly.com/uploads/1/3/1/4/131406843/tezizu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402724/normal_602e6e3a197ce.pdfIn PDF document text
    • https://nawodovifuvobix.weebly.com/uploads/1/3/0/9/130969758/6ea4c63327bdcf6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468563/normal_60273d8042281.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392649/normal_60281ede28526.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368265/normal_603829df2f5b9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366407/normal_5fdd0a8e0cf51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383128/normal_6024047b83e21.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407314/normal_5fe03b0428ad5.pdfIn PDF document text
    • https://wogifirum.weebly.com/uploads/1/3/1/0/131070377/vutiju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485822/normal_5fd7d00044d56.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/179f55e6-bad9-4744-b4ab-30784abb140e/wes_penre_books.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8332b685-8741-4df3-afad-0c5304466ae7/kojepebipa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0d085ae-afbb-46b4-8672-b32f63b2756d/how_to_use_onn_alarm_clock.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2f536c1-3515-4c03-928b-10530b388931/wrong_turn_1_full_movie_in_hindi_download_480p_bolly4u.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/835588ca-8927-45a8-ab67-c515cdf1f3a4/1584125403.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_off0000e931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE931 5504 bytes
SHA-256: ecaaa02910e953ecb2f0ab87defa50a9c95106746740ebb2f2abc36fc9ee1eff
font_01_sfnt_off0000fbec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEC 10588 bytes
SHA-256: f36316ec3126f03ff1d49e8b47aa313e060a259aad489ab2ba67e76f2d1b5d2d

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