Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cb03c12408be387…

MALICIOUS

PDF

86.1 KB Created: 2021-03-04 12:29:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 90bce1dc89d805c5393ec2ac3a6695eb SHA-1: b98b3fe6a81c70a8198ee2e5cf036398b529a6eb SHA-256: 1cb03c12408be38726152132aa5b5c69f27ac7da9de22140ad33a532165a993a
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm of external PDF links, with a prominent SEO redirector URL that appears to be a 'free-download phishing' lure. The document body, though partially corrupted, contains text related to 'essay writing template for middle school', suggesting a pretext for the user to click the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://dugedepap.ru/123?utm_term=essay+writing+template+for+middle+school PDF link annotation
    • https://cdn.sqhk.co/rogudokives/ieiiian/95685221619.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417309/normal_5fe787d59e89f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476453/normal_6023cd3c4d9ca.pdfIn PDF document text
    • http://bewizasosu.sportsontheweb.net/milugelakotedisipupozaro.pdfIn PDF document text
    • http://rawoxaxevog.mygamesonline.org/dozinejudero.pdfIn PDF document text
    • https://tevupiju.weebly.com/uploads/1/3/4/8/134865653/4822696.pdfIn PDF document text
    • https://cdn.sqhk.co/dumudegurit/idhjgix/31441745315.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447878/normal_601182201cf47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489042/normal_6015de94b3cfd.pdfIn PDF document text
    • https://cdn.sqhk.co/lixipadiwel/xrxJWjd/dozuxevolopawebolirojadi.pdfIn PDF document text
    • https://cdn.sqhk.co/wixakulu/vje9ijR/armello_switch_dragon_clan.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411270/normal_5ff362a2b8b87.pdfIn PDF document text
    • https://cdn.sqhk.co/lirerafi/jctigjj/kuzeko.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
    • http://rabatelekovufar.myartsonline.com/libros_de_fisica_universitaria.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

Related samples 3

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10619 5508 bytes
SHA-256: 9a7d2ae4c2b76429c4de1116b4f56d50da5d14b588130b83b49adcb37926cd09
font_01_sfnt_off000118b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B6 10548 bytes
SHA-256: fd493b8740c4022d86a6305ba894149b0046ce34e8e7c9f4245bccf02d248c8c
font_02_sfnt_off00013cde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CDE 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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