Malicious PDF — malware analysis report

Static analysis result for SHA-256 77776de6a270be93…

MALICIOUS

PDF

75.0 KB Created: 2021-03-03 21:35:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: f38017a41f116a7836c53aba06ffeee6 SHA-1: d4091db47553ceb5504dcccb6d7ece1eb16b2263 SHA-256: 77776de6a270be937fd542dcee7d3df4b1406c29e8087d0dc5b6e017e7956ad6
254 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains a large number of external links, with a critical heuristic identifying it as a PDF link farm. One of the primary URLs, https://crophysi.ru/award?keyword=the+giver+chapter+6-8+vocabulary, appears to be part of a malicious campaign. While no scripts were explicitly extracted, the nature of the link farm suggests a phishing or SEO poisoning attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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
  • 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.
  • 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.
  • 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://crophysi.ru/award?keyword=the+giver+chapter+6-8+vocabulary In PDF document text
    • https://zozisumuwukow.weebly.com/uploads/1/3/1/3/131380825/jojuboli.pdfIn PDF document text
    • http://gatowixipeba.mywebcommunity.org/delta_band_saw_parts_28-203.pdfIn PDF document text
    • http://bikejesoxatelo.mygamesonline.org/how_to_write_a_descriptive_essay_for_grade_6.pdfIn PDF document text
    • http://zijimesaxa.iblogger.org/ripizifimewizepijisom.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://powiwuroda.epizy.com/netgear_prosafe_jgs524pe_password.pdfIn PDF document text
    • https://s3.amazonaws.com/tesodagiwor/29024862859.pdfIn PDF document text
    • https://s3.amazonaws.com/xewamejixolefaj/stem_capstone_project.pdfIn PDF document text
    • https://s3.amazonaws.com/bibejovixapis/bijefotiziworisitatoz.pdfIn PDF document text
    • http://fidegaf.atwebpages.com/1997_honda_accord_transmission_rebuild_kit.pdfIn PDF document text
    • https://s3.amazonaws.com/vikukinumet/tiregozixemifuloret.pdfIn PDF document text
    • http://wavujeg.epizy.com/apc_smart_ups_2200_battery_backup.pdfIn PDF document text
    • https://s3.amazonaws.com/benubapopikaj/hadley_wickham_style_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/dictionary_google_play.pdfIn PDF document text
    • https://s3.amazonaws.com/dikobepibelun/travel_itinerary_template_canada_visa.pdfIn PDF document text
    • https://s3.amazonaws.com/sirilagewuga/23337079042.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 8

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

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e81e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81E 5648 bytes
SHA-256: a8ef9e90dcb5f21e7cdf2d4b1a5bfaa11046d56d49ea43fd0a25f9ec1298704f
font_01_sfnt_off0000fb65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB65 10496 bytes
SHA-256: 6b30ee52c724882d5f15945e9cf0a1bca37321d1caf132d33677adb0f6e6b3d5

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