PDF malware analysis — malicious · bfa1c10d9d16723e

MALICIOUS

PDF

105.2 KB Created: 2021-04-06 18:39:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20

MD5: 1dc05e55f19a7e01431ccfdff3fe00ce SHA-1: c197b30e140e62e1efafa1e24c8aecf8666b0db1 SHA-256: bfa1c10d9d16723e05cfa9b4f30e62ce0599ac446688cfda45f86b5b8ce7fbd6

254 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, including one pointing to a known malicious redirector. The document body, though heavily obfuscated, appears to be a lure for a free download. The presence of embedded links and the overall structure strongly suggest a phishing attempt designed to redirect users to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

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=bukhari+sharif+in+roman+english+pdf+free+download In PDF document text
- https://netivexis.weebly.com/uploads/1/3/4/0/134042514/xaxepefo.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4469104/normal_6054b9e049127.pdfIn PDF document text
- https://rewajugelawuz.weebly.com/uploads/1/3/0/7/130738764/gatikud.pdfIn PDF document text
- https://rekinijibir.weebly.com/uploads/1/3/2/3/132302710/8790725.pdfIn PDF document text
- https://gibotexoruz.weebly.com/uploads/1/3/4/6/134634126/3503171.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4530990/normal_601af41c4069c.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://s3.amazonaws.com/mefonevimimix/nunukojigofumevopefu.pdfIn PDF document text
- https://88966db1-4a83-4446-b941-f65022a6235f.filesusr.com/ugd/928e0f_9e9315e5c4fe426289edead9a212eae6.pdf?index=trueIn PDF document text
- https://95e354e6-8561-4e52-807b-deb85f3b5fdd.filesusr.com/ugd/ca9b0a_3ce5ae01fc044a2fa4724b4a06f93d4b.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/niwotipugonuvoz/43900428329.pdfIn PDF document text
- https://s3.amazonaws.com/zasepo/70079491588.pdfIn PDF document text
- https://s3.amazonaws.com/votawawo/gorenunumukoxu.pdfIn PDF document text
- https://s3.amazonaws.com/silubebebefuju/topizemudebuveseloza.pdfIn PDF document text
- https://s3.amazonaws.com/midaguvimabof/tipos_de_anorexia_nerviosa.pdfIn PDF document text
- https://s3.amazonaws.com/tetenifeme/97005469024.pdfIn PDF document text
- https://s3.amazonaws.com/vipuxafol/92127418429.pdfIn PDF document text
- https://s3.amazonaws.com/wolina/coding_guidelines_for_inpatient_rehabilitation.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://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
- http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_004_off00016f6a.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x16F6A	22960 bytes
SHA-256: `04a824add2f4a13d17c631f4ac3cbe82ee3799ea6047a499cd796c9538671ba5`
`font_00_sfnt_off00013302.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13302	5660 bytes
SHA-256: `5e51dd0811a0065c7e709cdf6b70d7f5ec25d96459d15a6d27bf485bfab4d1d1`
`font_01_sfnt_off00014630.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14630	12680 bytes
SHA-256: `4811b26e18d50d8326c85a4b881abfc30c805f5ed48717a0a6910189e9a0e101`

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