Malicious PDF — malware analysis report

Static analysis result for SHA-256 35d8baaba07ebff9…

MALICIOUS

PDF

58.0 KB Created: 2020-12-15 21:04:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3d74c69c8f22f9f75946d022f35b1e5c SHA-1: 7ae70816f8d213717642eccd5c72f37d0c5259bd SHA-256: 35d8baaba07ebff9adbcc51ee598786b58aeb2a1e6df0f9ff8654e13784e2280
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one identified as a malicious redirector. The heuristic firings indicate a link farm and a critical ClamAV detection for Pdf.Phishing.Trojan. The document body, though partially corrupted, suggests a lure related to a computer manual. No scripts were extracted from this sample, but the presence of malicious links points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffmen.ru/123?utm_term=stromer+st1+computer+manual
    • https://vigajinid.weebly.com/uploads/1/3/4/8/134889024/f8e3b.pdf
    • https://magozenidudib.weebly.com/uploads/1/3/4/7/134711122/9455711.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc0f5b088c99b6d37a76c18/t/5fc22f10e18c5c478e44c4d4/1606561552235/29893000775.pdf
    • https://s3.amazonaws.com/pazifetanegapu/biology_notes_form_two.pdf
    • https://uploads.strikinglycdn.com/files/fade9032-e05d-4356-814d-540798dc2b6e/universal_wave_equation_worksheet.pdf
    • https://uploads.strikinglycdn.com/files/53f8bfa5-6256-4257-8d28-e993ef8383da/28069355300.pdf
    • https://uploads.strikinglycdn.com/files/e90c00bc-42c7-4e75-bb6c-0b78e89910b2/fivasogebukurerunep.pdf
    • https://uploads.strikinglycdn.com/files/e80b36d0-5886-496e-b486-ce24ea0420dd/vipojixatavaseg.pdf
    • https://static1.squarespace.com/static/5fc0c48c104edf1d778017d3/t/5fc35ca1e18c5c478e666409/1606638755042/vijub.pdf
    • https://uploads.strikinglycdn.com/files/8cc5c885-24f2-429c-abfb-622e5a139189/panetubonatanexafok.pdf
    • https://uploads.strikinglycdn.com/files/9e997526-3839-488b-89bc-2ecefd7257c6/lamezobidalutoxi.pdf
    • https://static1.squarespace.com/static/5fc5073312facd59cec7706f/t/5fc8c1ae13f8d93bf20c8271/1606992303114/buvafodinejusalizodi.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf5f9f7acac6192ab88a4d/1606377376018/xarimepapoletisifo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ab3b.bin
5446537838c76ecda0da84c84978a5b095194678069fd8f146a79266a10abdd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAB3B 5236 bytes
font_01_sfnt_off0000bcf5.bin
7d24ba6b06af6b47dac083ee8859609dd569a2cc448845a26c5482ec25ccfaaf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBCF5 9012 bytes

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